Symbol
K
Atomic Number
19
Atomic Mass
39.098
Protons
19
Neutrons
20
Electrons
19
Type
Alkali Metal
Isotopes
Potassium-39, Potassium-40, Potassium-41
Discovery Year
1807
Discovered By
Humphry Davy
Group
1
Period
4
Boiling Point
1407°F
Melting Point
145°F
Electron Configuration
[Ar] 4s¹
Density (g/cm³)
0.862
Crystal Structure
Body-centered cubic
Magnetism
Paramagnetic
Abundance in Earth's Crust
2.6%
Phase at Room Temperature
Solid