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date: 09 August 2020

radium (Symbol Ra). 

A Dictionary of Chemistry
Jonathan LawJonathan Law, Richard RennieRichard Rennie

A radioactive metallic element belonging to *group 2 (formerly IIA) of the periodic table; a.n. 88; r.a.m. 226.0254; r.d. ~5; m.p. 700°C; b.p. 1140°C. It occurs in uranium ores (e.g. pitchblende). The most stable isotope is radium-226 (half-life ... ...

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