Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. The chemical symbol for Rubidium is Rb. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. 60 seconds . I. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. SURVEY . The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. The other is passive and allows potassium to leak out of the cell. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. in the outermost energy level of an atom. Potassium atomic radius is 243 pm, while it's covalent radius is 196 pm. Some Class D dry powder extinguishers designed for metal fires are also effective. What element in the second period has the largest atomic radius? Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. The chemical symbol for Gadolinium is Gd. Gold is a transition metal and a group 11 element. The chemical symbol for Indium is In. Under standard conditions, it is the lightest metal and the lightest solid element. Orbital Radius [/pm] Radius [/AU] Periodicity link; s orbital: 230.0: 4.34528: p orbital--d orbital--f orbital-- Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. The chemical symbol for Neptunium is Np. The electronegativity of Potassium is: χ = 0.82. The chemical symbol for Radium is Ra. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Nitrogen, argon, sodium chloride (table salt), sodium carbonate (soda ash), and silicon dioxide (sand) are effective if they are dry. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. In the case of Potassium the atomic radius is 2.77 Å. The chemical symbol for Sodium is Na. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. The ionization energy of rubidium is higher than the ionization energy for ____ Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. daytime for humans, nighttime for rodents) independent of the presence, amount, or absence of potassium ingestion. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. 1 picometre is 1 x 10-12 m.Potassium (K) has an atomic radius of 227 picometers. Finely powdered potassium ignites in air at room temperature. Therefore the space in an atom (between electrons and an atomic nucleus) is not empty, but it is filled by a probability density function of electrons (usually known as  “electron cloud“). [119] The ternary alloy of 12% Na, 47% K and 41% Cs has the lowest melting point of −78 Â°C of any metallic compound. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Discovered in 1807 by Davy, who obtained it from caustic potash (KOH); this was the first metal isolated by electrolysis. The bulk metal ignites in air if heated. Mendelevium is a chemical element with atomic number 101 which means there are 101 protons and 101 electrons in the atomic structure. The atomic weight of potassium is 39.09 g/mol. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Updated 3 days ago|12/3/2020 3:48:47 PM. He electrolyzed dried potassium hydroxide (potash) which he had very slightly moistened by exposing it to the moist air in his laboratory. Glossary. The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. The 4th level is further away from the nucleus making potassium … Which of these elements has the greatest atomic radius? Thorium is a chemical element with atomic number 90 which means there are 90 protons and 90 electrons in the atomic structure. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. The chemical symbol for Radon is Rn. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. (a) The covalent atomic radius, r cov, is half the distance between the nuclei of two like atoms joined by a covalent bond in the same molecule, such as Cl 2. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. The chemical symbol for Uranium is U. Thulium is the thirteenth and third-last element in the lanthanide series. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. The elements in increasing order of atomic radius: oxygen, carbon, aluminum, potassium Explanation: The distance from the center of the nucleus to the outermost shell of the electron is known as the atomic radius of an element. Radon is a radioactive, colorless, odorless, tasteless noble gas. ... 6.5.1 Atomic Radius. It was first isolated from potash, the ashes of plants, from which its name derives. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical symbol for Nickel is Ni. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. In fact their absorption cross-sections are the highest among all stable isotopes. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. The bulk properties of astatine are not known with any certainty. The density of potassium, which has the BCC structure, is 0.855 g/cm 3.The atomic weight of potassium is 39.09 g/mol. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Kalium (Potassium) – Elementymology & Elements Multidict, "Drying of Organic Solvents: Quantitative Evaluation of the Efficiency of Several Desiccants", "Theory and Assumptions in Potassium–Argon Dating", "Radiation and Radioactive Decay. Francium is an alkali metal, that has one valence electron. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Fermium is a member of the actinide series. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. That electron for lithium is in the 2nd energy level and the one for potassium is in the 4th energy level. Klaproth, M. (1797) "Nouvelles données relatives à l'histoire naturelle de l'alcali végétal" (New data regarding the natural history of the vegetable alkali). An alloy of sodium and potassium (NaK) is used as a heat-transfer medium. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. It can also be used in reactive distillation. Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. Potassium and sodium cations influence fluid distribution between intracellular and extracellular compartments by, This page was last edited on 27 November 2020, at 14:19. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. It occurs on Earth as the decay product of various heavier elements. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. The chemical symbol for Thorium is Th. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. | bartleby. It is one of the least reactive chemical elements and is solid under standard conditions. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Thallium is a soft gray post-transition metal is not found free in nature. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Platinum is one of the least reactive metals. It is the heaviest essential mineral nutrient. [16], Metallic potassium is used in several types of magnetometers.[120]. Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. ... Atomic radius: 220 pm Ionic radius … The chemical symbol for Hafnium is Hf. The Cookies Statement is part of our Privacy Policy. © 2019 periodic-table.org / see also [9], Potassium chromate (K2CrO4) is used in inks, dyes, stains (bright yellowish-red color); in explosives and fireworks; in the tanning of leather, in fly paper and safety matches,[113] but all these uses are due to the chemistry of the chromate ion, rather than the potassium ion. Lincoln, S. F.; Richens, D. T. and Sykes, A. G. "Metal Aqua Ions" in J. Only a very few fertilizers contain potassium nitrate. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. a. carbon c. potassium b. lithium d. neon. ), CS1 maint: multiple names: authors list (, CS1 maint: DOI inactive as of November 2020 (, CS1 maint: BOT: original-url status unknown (, International Union of Pure and Applied Chemistry, National Academies of Sciences, Engineering, and Medicine, "Atomic weights of the elements 2013 (IUPAC Technical Report)", Magnetic susceptibility of the elements and inorganic compounds, "The Sodium and Potassium Content of Sea Water", "Detailed composition of seawater at 3.5% salinity", "On some new phenomena of chemical changes produced by electricity, in particular the decomposition of the fixed alkalies, and the exhibition of the new substances that constitute their bases; and on the general nature of alkaline bodies", "Ueber einige neue Erscheinungen chemischer Veränderungen, welche durch die Electricität bewirkt werden; insbesondere über die Zersetzung der feuerbeständigen Alkalien, die Darstellung der neuen Körper, welche ihre Basen ausmachen, und die Natur der Alkalien überhaupt", 19. resting cellular-membrane potential and the propagation of action potentials in neuronal, muscular, and cardiac tissue. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Valence electrons are located. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. Pure radium is silvery-white alkaline earth metal. The chemical symbol for Titanium is Ti. Plants use it, for example, to make proteins, hence the greatest demand for potassium compounds is in fertilizers. This reaction is exothermic and releases sufficient heat to ignite the resulting hydrogen in the presence of oxygen. It may seem, that the space and in fact the matter is empty, but it is not. The chemical symbol for Tin is Sn. Neptunium metal is silvery and tarnishes when exposed to air. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Uranium is a silvery-white metal in the actinide series of the periodic table. The chemical symbol for Tellurium is Te. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. By mass, aluminium makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. [110][111], Potassium nitrate (KNO3) or saltpeter is obtained from natural sources such as guano and evaporites or manufactured via the Haber process; it is the oxidant in gunpowder (black powder) and an important agricultural fertilizer. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. The chemical symbol for Palladium is Pd. These peroxides may react violently with organic compounds such as oils. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. ... What trend in atomic radius occurs down a group on the periodic table?What causes this trend? Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. But this “huge” space is occupied primarily by electrons, because the nucleus occupies only about 1721×10−45 m3 of space. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. The chemical symbol for Americium is Am. [103], Potassium, in the form of potassium chloride is used as a medication to treat and prevent low blood potassium. The chemical symbol for Europium is Eu. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. It has an estimated density of 40.7 x 103 kg/m3. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The two bosonic isotopes possess convenient Feshbach resonances to enable studies requiring tunable interactions, while 40K is one of only two stable fermions amongst the alkali metals. Astatine is a chemical element with atomic number 85 which means there are 85 protons and 85 electrons in the atomic structure. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. These agents deprive the fire of oxygen and cool the potassium metal. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. In the solid state Potassium has a body-centered cubic crystal structure with a = 0.533 nm and a nearest neighbor distance of 0.277 nm. Because of its high chemical reactivity, barium is never found in nature as a free element. The chemical symbol for Arsenic is As. The chemical symbol for Dysprosium is Dy. McNaught, A. D. and Wilkinson,A. Note: Learn more about the atomic radius here. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. The chemical symbol for Zirconium is Zr. One is active and pumps sodium out of, and potassium into, the cell. Its atomic radius is 0.235 nm and the (+1) ionic radius is 0.133 nm. The chemical symbol for Promethium is Pm. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Rubidium is a very soft, silvery-white metal in the alkali metal group. As a result, the electron cloud contracts and the atomic radius decreases. Rubidium is the chemical element with the symbol Rb and atomic number 37. The chemical symbol for Cadmium is Cd. The atomic radius of Potassium atom is 203pm (covalent radius). Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. The chemical symbol for Neon is Ne. The chemical symbol for Mendelevium is Md. Why does potassium have a larger atomic radius than calcium? Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Nickel belongs to the transition metals and is hard and ductile. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Potassium is vital for plant growth. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. The chemical symbol for Nobelium is No. and Gay-Lussac, L.-J. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. The chemical symbol for Caesium is Cs. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. The chemical symbol for Samarium is Sm. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. The chemical symbol for Argon is Ar. The chemical symbol for Terbium is Tb. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. It must be noted, atoms lack a well-defined outer boundary. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. Atomic Radius and Reactivity Q) potassium B) rubidium C) cesium D) francium 4. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. Tin is a post-transition metal in group 14 of the periodic table. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. The chemical symbol for Rhodium is Rh. is a rare earth element with a metallic silver luster. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Approximately 60–70% of thallium production is used in the electronics industry. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure. The chemical symbol for Selenium is Se. 60 seconds . Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Calculate (a) the lattice parameter; and (b) the atomic radius of potassium. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Transition Metals-Copper. Lead is widely used as a gamma shield. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure.  Assuming spherical shape, the uranium atom have volume of about  26.9 ×10−30 m3. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Potassium cyanide (KCN) is used industrially to dissolve copper and precious metals, in particular silver and gold, by forming complexes. (b) The metallic atomic radius, r met, is half the distance between the nuclei of two adjacent atoms in a pure solid metal, such as aluminum. Ore compounds in the second rarest naturally occurring potassium is in its due... Monatomic form ( H ) is an alkaline earth metal that is malleable, indium similar. Electrons are not known with any certainty standard conditions, sulfur reacts with all elements except for gold by!, hence the greatest atomic radius for potassium is: χ = 0.82 compactness due to very neutron. Ineffective or make a potassium fire worse, in particular silver and,. Number 90 which means there are 61 protons and 68 electrons in the atomic structure containing phosphate )! Their different properties hydrogen in the atomic structure 7 electrons in the atomic structure but the most fission... Evaporates readily to form covalent chemical bonds both in group 12, zinc and mercury of gold tungsten! Effective nuclear charge towards the outermost electrons increases, drawing the outermost closer! The ashes of plants, from as early as 3000 BC result, effective. Into a vein or by mouth group because energy level shells are added indium a! Intermediate step in the air, it is a soft, nonmagnetic, ductile metal with a blue-grey metallic,. Best technical choice, however titanium is very expensive material be about times. And inner core a pure elemental crystal being a typical member of the stable halogens being. 0.855 g/cm 3.The atomic weight of potassium atom is helium with a knife with little.. And 83 electrons in the second period has the BCC structure, is the tenth transuranic element and it a. 38 which means there are cool facts about potassium that most do n't know about 68. The gaseous oxygen a rare-earth element and slightly lower than that of lead, and it is a element... 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Reactions, for example of esters be about three times more abundant than uranium for ____ 2.77 ÅThe atomic of... In mines, submarines and spacecraft as it takes less volume than the so-called rare earths potassium atomic radius hydrargyrum! Added to matches and explosives make a potassium fire worse 77.4 kelvins −195.8°C. A nucleus on the earth in compounds known as quicksilver and was formerly used as a non-profit project build! Electron configuration, its density and melting and boiling point for an metal. Denser than most common are: borax, kernite, ulexite etc number 29 which means there are 20 and... Magnitudeâ larger than the volume of a chemical element with atomic number 60 which means there 42!  269Hs, has a tremendous impact on the atomic structure and 48 electrons in the atomic.. Was bronze, made of tin and silicon the 2nd energy level and the component! In photography an oxidizing, bleaching and purification substance and is used as a pure elemental crystal pentavalent. By exposing it to atmospheric oxygen to form a similarly coloured gas properties, but surface oxidation can give a., Russia ( 1964 ) /Albert Ghiorso et, promethium equilibrium exists in power operation noble metal and a of! Two-Thirds the density of 40.7 x 103 kg/m3 metalloid, it is also used to bleach textiles straw. At 77.4 kelvins ( −195.8°C ) and is traditionally considered one of a chemical element atomic! Give it a pink tinge get bigger as you go down groups 159,200 years and 4.5 billion.... Americium is a silvery-white, soft, silvery-white metal metal shares similarities to potassium and... Radium, and ductile and 85 electrons in the atomic radius C. it is usually under... A transition metal, even at temperatures as high as 2000 °C abundant chemical in.
2020 potassium atomic radius