మూస:Infobox radium

రేడియం, ₀₀Ra

రేడియం
Pronunciation	/ˈreɪdiəm/ ​(RAY-dee-əm)
Appearance	silvery white metallic
రేడియం in the periodic table
Group	group 2 (alkaline earth metals)
Period	period 7
Block
Electrons per shell	2, 8, 18, 32, 18, 8, 2
Physical properties
Phase at STP	solid
Melting point	973 K ​(700 °C, ​1292 °F)
Boiling point	2010 K ​(1737 °C, ​3158.6 °F)
Density (near r.t.)	5.5 g/cm3
Heat of fusion	8.5 kJ/mol
Heat of vaporization	113 kJ/mol
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 819 906 1037 1209 1446 1799
Atomic properties
Oxidation states	+2 (expected to have a strongly basic oxide)
Electronegativity	Pauling scale: 0.9
Covalent radius	221±2 pm
Van der Waals radius	283 pm
Other properties
Natural occurrence	from decay
Crystal structure	​body-centered cubic (bcc)
Thermal conductivity	18.6 W/(m⋅K)
Electrical resistivity	1 µ Ω⋅m (at 20 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-14-4
History
Discovery	Pierre Curie and Marie Curie (1898)
First isolation	Marie Curie (1902)
Isotopes of రేడియం

References

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