19
39.098 u
K
Potassium
Alkali Metal
Atomic Structure
Physical State
Group
1
Period
4
Block
s
Electron Configuration
[Ar] 4s¹
Physical Properties
Atomic Mass:
39.098 u
Electronegativity:
0.82
Atomic Radius:
275 pm
Ionization Energy:
4.341 eV
Density:
0.862 g/cm³
Melting Point:
336.53 K
Boiling Point:
1032 K
Historical Information
Discovered By:
Humphry Davy
Year Discovered:
1807