Symbol
Ra
Atomic Number
88
Atomic Mass
226
Protons
88
Neutrons
138
Electrons
88
Type
Alkaline Earth Metal
Isotopes
Radium-226
Discovery Year
1898
Discovered By
Marie Curie, Pierre Curie, and others
Group
2
Period
7
Boiling Point
1413°C
Melting Point
700°C
Electron Configuration
[Rn] 7s²
Density (g/cm³)
5.5
Crystal Structure
Face-centered cubic
Magnetism
Paramagnetic
Abundance in Earth's Crust
Trace
Phase at Room Temperature
Solid