Polonyo

Ang polonyo (Iningles polonium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Po ug kaiphan nga atomik 84. Ang polonyo mao ang puthaw.

Polonium
84Po
Te ↑ Po ↓ Lv Periodic table bismuth ← polonium → astatine
Panagway
silvery
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	polonium, Po, 84
Paglitok	/[unsupported input]poʊˈloʊniəm/ [[Help:Pronunciation respelling key|po-Plantilya:Smallcaps all-nee-əm]]
Kategoriyang elemento	post-transition metal post-transition metal status is disputed (see article text)
Group, period, block	16, 6, p
Gibug-aton sa atomo	(209)
Kontorno sa elektron	[Xe] 6s2 4f14 5d10 6p4 2, 8, 18, 32, 18, 6 Electron shells of polonium (2, 8, 18, 32, 18, 6)
History
Pagkadiskobre	Pierre Curie and Marie Curie (1898)
First isolation	Willy Marckwald (1902)
Physical properties
Phase	magahi
Density (near r.t.)	(alpha) 9.196 g·cm−3
Density (near r.t.)	(beta) 9.398 g·cm−3
Melting point	527 K, 254 °C, 489 °F
Boiling point	1235 K, 962 °C, 1764 °F
Heat of fusion	ca. 13 kJ·mol−1
Heat of vaporization	102.91 kJ·mol−1
Molar heat capacity	26.4 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K)       (846) 1003 1236
Atomic properties
Oxidation states	6, 4, 2, −2 (amphoteric oxide)
Electronegativity	2.0 (Pauling scale)
Ionization energies	1st: 812.1 kJ·mol−1
Atomic radius	168 pm
Covalent radius	140±4 pm
Van der Waals radius	197 pm
Miscellanea
Crystal structure	cubic
Magnetic ordering	nonmagnetic
Electrical resistivity	(0 °C) (α) 0.40 µΩ·m
Thermal conductivity	? 20 W·m−1·K−1
Thermal expansion	(25 °C) 23.5 µm·m−1·K−1
CAS registry number	7440-08-6
Most stable isotopes
Main article: Isotopes of polonium
iso NA half-life DM DE (MeV) DP 208Po syn 2.898 y α 5.215 204Pb β+ 1.401 208Bi 209Po syn 103 y α 4.979 205Pb β+ 1.893 209Bi 210Po trace 138.376 d α 5.307 206Pb
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