88Ra
Radium
라듐 · ラジウム
Alkaline earth
Atomic number88
ElementRa — Radium
Atomic mass226
CategoryAlkaline earth
Group2
Period7
Electron config[Rn] 7s2
Shells2,8,18,32,18,8,2
State (RT)Solid
Melting pt700°C
Boiling pt1737°C
Electronegativity0.9
Discovered1898
Main usesCancer therapy (historic), research
2 · 8 · 18 · 32 · 18 · 8 · 2