Template:Infobox radium

Radium,  ₈₈Ra

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery white metallic
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Radium in the periodic table
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Atomic number (Z)	88
Group	Template:Infobox element/group
Period	period 7
Block	s-block
Element category	Template:Infobox element/category format
Electron configuration	[Rn] 7s2
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	973 K ​(700 °C, ​1292 °F) (disputed)
Boiling point	2010 K ​(1737 °C, ​3159 °F)
Density (near r.t.)	5.5 g/cm3
Heat of fusion	8.5 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	113 kJ/mol
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 0.9
[[Ionization energy|Template:Engvar energies]]	1st: 509.3 kJ/mol 2nd: 979.0 kJ/mol
Covalent radius	221±2 pm
Van der Waals radius	283 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Thermal conductivity	18.6 W/(m·K)
Electrical resistivity	1 µΩ·m (at 20 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-14-4
History
Discovery	Pierre and Marie Curie (1898)
First isolation	Marie Curie (1910)
Main isotopes of radium
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