• Latin name:
  Kalium
• English name:
  Potassium
• Year discovered:
  1807
• Discovered by:
  Humphry Davy
• Country of Discovery:
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• Cost per 100 grams:
  2.36 USD
• CAS Number:
  CAS7440-09-7
• Electron shell:
  K2-L8-M8-N1-O0-P0-Q0-R0

Potassium is a chemical element with symbol K (derived from Neo-Latin, kalium) and atomic number 19. It was first isolated from potash, the ashes of plants, from which its name is derived. In the Periodic table, potassium is one of seven elements in column (group) 1 (alkali metals):they all have a single valence electron in their outer electron shell, which they readily give up to create an atom with a positive charge - a cation, and combine with anions to form salts.

• Atomic number:
  19
• Atomic weight (Relative atomic mass):
  39.0983009088233 (g/mol)
• Density:
  0.862 (g/cm³)
• Melting point:
  63.5°C = 146.30°F = 336.65K
• Boiling point:
  759.0°C = 1398.20°F = 1032.15K
• Valence electrons:
  1
• Period:
  4
• Group:
  IA
• Block:
  s - block
• Emission spectrum:
  

• Phase:
  Solid

  
• Fusion heat:
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• Specific heat:
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• Thermal expansion:
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• Vaporization heat:
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• Electron configuration:
  [Ar] 4s1 = 1s2 2s2 2p6 3s2 3p6 4s1
Oxidation states:

• -
• -1
• -
• -
• -
• -
• +1
• -
• -
• -
• -
• -
• -
• -
• -
• Ion charge:
  K¹⁺
• The ionization potential of an atom:
  4.341 (eV)
• Atomic radius:
  235 (pm)
• Covalent radius:
  200 (pm)
• Van der Waals radius:
  275 (pm)

• Electrical conductivity:
  13888888.8888889 (S/m)
• Electrical type:
  Conductor
• Magnetic type:
  ----
• Volume magnetic susceptibility:
  5.74 ⋅ 10^-6
• Mass magnetic susceptibility:
  6.7 ⋅ 10^-9
• Molar magnetic susceptibility:
  2.62 ⋅ 10^-10 (m³/mol)
• Resistivity:
  7.26 ⋅ 10^-8 (Ω · m)
• Superconducting point:
  ----

• Debye temperature:
  -173.15°C = -279.67°F = 100K

• Colour:
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• CAS Number:
  CAS7440-09-7
• CID Number:
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• RTEC Number:
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• Brinell hardness:
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• Mohs hardness:
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• Vickers hardness:
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• Bulk modulus:
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• Young's modulus:
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• Liquid density:
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• Molar volume:
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• Poisson's ratio:
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• Shear modulus:
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• Speed of sound transmission:
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• Refractive index:
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• Thermal conductivity:
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• Electronegativity:
  0.82
• Valence electrons:
  1
• Electron affinity:
  48.383 kJ/mole

• Radioactive:
  No
• Half life:
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• Lifetime:
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• Neutron cross section, barn:
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• Universe contains "Potassium" at the rate of
  0.0003%
• Sun contains "Potassium" at the rate of
  0.0004%
• Oceans contain "Potassium" at the rate of
  0.042%
• Human body contains "Potassium" at the rate of
  0.19975484739351%
• The Earth's crust consists of "Potassium" at the rate of
  2.09%
• Meteorites consist of "Potassium" at the rate of
  0.07%