Periodic Table of the Elements: Radium

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Periodic Table of the Elements: Radium
Atomic Number:88
Atomic Symbol:Ra
 Radiumradium
[Lat. radius=ray], radioactive metallic chemical element; symbol Ra; at. no. 88; mass number of most stable isotope 226; m.p. 700°C;; b.p. 1,140°C;; sp. gr. about 6.0; valence +2. Radium is a lustrous white radioactive metal.
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Atomic Weight:(226)
Electron Configuration:2 · 8 · 18 32 · 18 8 · 2
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