మూస:Infobox polonium

పొలోనియం, ₀₀Po

పొలోనియం
Pronunciation	/pəˈloʊniəm/ ​(pə-LOH-nee-əm)
Allotropes	α, β
Appearance	silvery
Mass number	[209]
పొలోనియం 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 Te ↑ Po ↓ Lv బిస్మత్ ← పొలోనియం → ఆస్టాటైన్
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	p-block
Electron configuration	[Xe] 4f14 5d10 6s2 6p4
Electrons per shell	2, 8, 18, 32, 18, 6
Physical properties
Phase at STP	solid
Melting point	527 K ​(254 °C, ​489 °F)
Boiling point	1235 K ​(962 °C, ​1764 °F)
Density (near r.t.)	(alpha) 9.196 g/cm3 (beta) 9.398 g/cm3
Heat of fusion	ca. 13 kJ/mol
Heat of vaporization	102.91 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K)       (846) 1003 1236
Atomic properties
Oxidation states	−2, +2, +4, +5, +6 (an amphoteric oxide)
Electronegativity	Pauling scale: 2.0
Atomic radius	empirical: 168 pm
Covalent radius	140±4 pm
Van der Waals radius	197 pm
Spectral lines of పొలోనియం
Other properties
Natural occurrence	from decay
Crystal structure	​cubic
Thermal expansion	23.5 µm/(m⋅K) (at 25 °C)
Thermal conductivity	? 20 W/(m⋅K)
Electrical resistivity	(α) 0.40 µ Ω⋅m (at 0 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-08-6
History
Discovery	Pierre Curie and Marie Curie (1898)
First isolation	Willy Marckwald (1902)
Isotopes of పొలోనియం

References

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