Polonium

Polonium (pípè /pɵˈloʊniəm/, po-LOH-nee-əm) je ipilese kemika pelu ami-idamo Po ati nomba atomu 84, ti Marie Skłodowska-Curie ati Pierre Curie se awari ni 1898.

Polonium, ₈₄Po

Polonium
Pípè	/pəˈləʊniəm/ ​(pə-LOH-nee-əm)
Ìhànsójú	silvery
nọ́mbà ìsújọ	[209]
Polonium ní orí tábìlì àyè
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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Te ↑ Po ↓ Lv bismuth ← polonium → astatínì
Nọ́mbà átọ̀mù (Z)	84
Ẹgbẹ́	group 16 (chalcogens)
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-p
Ẹ̀ka ẹ́límẹ́ntì	Post-transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f14 5d10 6s2 6p4
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 18, 6
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	527 K ​(254 °C, ​489 °F)
Ígbà ìhó	1235 K ​(962 °C, ​1764 °F)
Kíki (near r.t.)	(alpha) 9.196 g/cm3 (beta) 9.398 g/cm3
Heat of fusion	ca. 13 kJ/mol
Heat of	102.91 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 2.0
Atomic radius	empirical: 168 pm
Covalent radius	140±4 pm
Van der Waals radius	197 pm
Color lines in a spectral range Spectral lines of polonium
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
Main isotopes of polonium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 208Po syn 2.898 y α 5.215 204Pb ε, β+ 1.401 208Bi 209Po syn 103 y α 4.979 205Pb ε, β+ 1.893 209Bi 210Po trace 138.376 d α 5.307 206Pb