Template:Infobox potassium

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Potassium,  19K
Potassium-2.jpg
Potassium pearls (in paraffin ile, ~5 mm ilk)
General properties
Appearance sillery gray
Staundart atomic wecht (Ar, staundart) 39.0983(1)[1]
Potassium in the periodic cairt
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gowd Mercur (element) Thallium Leid (element) Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Na

K

Rb
argonpotassiumcalcium
Atomic nummer (Z) 19
Group group 1 (alkali metals)
Period period 4
Element category   alkali metal
Block s-block
Electron confeeguration [Ar] 4s1
Electrons per shell
2, 8, 8, 1
Pheesical properties
Phase (at STP) solit
Meltin pynt 336.7 K ​(63.5 °C, ​146.3 °F)
Bylin pynt 1032 K ​(759 °C, ​1398 °F)
Density (near r.t.) 0.862 g/cm3
when liquid (at m.p.) 0.828 g/cm3
Creetical pynt 2223 K, 16[2] MPa
Heat o fusion 2.33 kJ/mol
Heat o vapourisation 76.9 kJ/mol
Molar heat capacity 29.6 J/(mol·K)
Atomic properties
Oxidation states 1, −1 ​strangly basic oxide
Electronegativity Pauling scale: 0.82
Ionisation energies
Atomic radius empirical: 227 pm
Covalent radius 203±12 pm
Van der Waals radius 275 pm
Coloyr lines in a spectral range
Spectral lines o Infobox potassium
Miscellanea
Creestal structurbody-centred cubic (bcc)
Body-centered cubic creestal structur for potassium
Speed o soond thin rod 2000 m/s (at 20 °C)
Thermal expansion 83.3 µm/(m·K) (at 25 °C)
Thermal conductivity 102.5 W/(m·K)
Electrical resistivity 72 n Ω·m (at 20 °C)
Magnetic orderin paramagnetic[3]
Young's modulus 3.53 GPa
Shear modulus 1.3 GPa
Bouk modulus 3.1 GPa
Mohs haurdness 0.4
Brinell haurdness 0.363 MPa
CAS Nummer 7440-09-7
History
Diskivery Humphry Davy (1807)
First isolation Humphry Davy (1807)
Main isotopes o potassium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
39K 93.26% stable 40K 0.012% 1.248(3)×109 y β 40Ca
ε 40Ar
β+ 40Ar
41K 6.73% stable
| references | in Wikidata

References

Thir references will appear in the airticle, but this list appears anerly on this page.
  1. Meija, J.; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305. 
  2. Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nt ed.). CRC Press. p. 4.122. ISBN 1439855110. 
  3. Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.