మూస:Infobox radium

రేడియం, ₀₀Ra

రేడియం
Pronunciation	/ˈreɪdiəm/ ​(RAY-dee-əm)
Appearance	silvery white metallic
Mass number	[226]
రేడియం in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Ba ↑ Ra ↓ Ubn ఫ్రాన్షియం ← రేడియం → ఆక్టీనియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 7
Block	s-block
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)
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
Spectral lines of రేడియం
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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