Potassium

Alkali metals · Group 1 · Period 4

Atomic properties

Atomic number	19
Symbol	K
Standard atomic weight	39.098
Classification	Alkali metals
Group	1
Period	4
Block	s-block
Electron configuration	[Ar] 4s1
Electronegativity (Pauling)	0.82
Common oxidation states	+1

Physical properties

Phase at 20 °C	Solid
Density	0.862 g/cm³
Melting point	63.5 °C
Boiling point	759 °C
Discovered	1807
CAS number	—

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