element no. 19

GENERAL PROPERTIES
Name: Potassium
Symbol: K
Atomic Number: 19
Element category: alkali metal
Group, period, block: 1, 4, s
Standard atomic weight: 39.0983(1)
Electron configuration : [Ar] 4s1
Electrons per shell: 2, 8, 8, 1

PHYSICAL PROPERTIES
Phase: solid
Density (near r.t.): 0.862 g·cm−3
Liquid density at m.p.: 0.828 g·cm−3
Melting point: 336.53 K, 63.38 °C, 146.08 °F
Boiling point: 1032 K, 759 °C, 1398 °F
Triple point: 336.35 K (63°C), kPa
Heat of fusion: 2.33 kJ·mol−1
Heat of vaporization: 76.9 kJ·mol−1
Molar heat capacity: 29.6 J·mol−1·K−1

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