KZ =  19

From the Modern Latin "potassa", meaning "pot-ash"
(AM) Atomic Mass 39.0983  amu    Oxidation States +1
   (BP) Boiling Point 759.9  °C    (MP) Melting Point 63.25  °C
   (ρ) Density 0.87  g/cm3    Crystal Structure Body Centered Cubic
   ( χ ) Electronegativity 0.8    (AR) Atomic Radius 1.96  Å
   Physical State Solid (C) Heat Capacity 0.757  J/g °C
Electronic-Config [Ar]  4s1     (I1) First Ionization E 418.84  kJ/mol
   (ΔHvap) Heat of Vaporization 76.9  kJ/mol     (ΔHfus) Heat of Fusion 2.321  kJ/mol
   Year of Discovery 1807    Location of Discovery England
(E°) Standard Potential K+⇔ K (-2.931 V)
Stable isotopes  39K,  41K
Discovered/Synthesized by Sir Humphry Davy
Natural Source The mineral/ore sylvite, brines, and langbeinite
Common Uses Soap, fertilizer, potash, matches, gunpowder
Other Info Latin name: Kalium
Crucial element in artificial fertilizers
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