Relative atomic mass: [226]

English: Radium
French: Radium
Croatian: Radij
German: Radium
Italian: Radio
Spanish: Radio

Atomic number: 88
Group numbers: 2
Period: 7
Standard state (20 oC): solid

Discovery: 1898 Marie Sklodowska Curie, Perre Curie (FR)
Radium was discovered by Marie Sklodowska Curie and Perre Curie (FR) in 1898. The origin of the name comes from the Latin word radius meaning ray. It is a silvery-white radioactive metal that reacts with oxygen and water. It is highly radiotoxic and carcinogen by inhalation, ingestion, or exposure. Radium is found in uranium ores at 1 part per 3 million parts uranium. Used in treating cancer because of the gamma rays it gives off.
Electronic configuration: [Rn] 7s2
Formal oxidation number: +2
Atomic radius: 235 pm

Electronegativities: 0.9
Thermal conductivity: 18.6 W/(m K)
Electrical resistivity (20 oC): 100 microOhm cm

Melting point: 700 oC
Boiling point: 1140 oC

Heat of fusion: 7.15 kJ/mol
Heat of vaporization: 136.7 kJ/mol
Heat of atomization: 159 kJ/mol

87Fr <= 88Ra => 89Ac

ASCII Periodic Table of the Elements
29 Aug. 2017
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