Potassium
19
argon ← potassium → calcium
Na
↑
K
↓
Rb
Periodic table – Extended periodic table
General
Name, symbol, number
potassium, K, 19
Chemical series
alkali metals
Group, period, block
1, 4, s
Appearance
silvery white
Standard atomic weight
39.0983(1) g·mol−1
Electron configuration
4s1
Electrons per shell
2, 8, 8, 1
Physical properties
Phase
solid
Density (near r.t.)
0.89 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
Atomic properties
Crystal structure
cubic body centered
Oxidation states
1
(strongly basic oxide)
Electronegativity
0.82 (Pauling scale)
Ionization energies
(more)
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