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Polonium

Metal radioactivesolid
Symbol: Po
Atomic number: 84
Atomic mass: (208.9824)
Group: Metal
CAS-number: 7440-08-6

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 18, 6
Orbitals: [Xe] 4f14 5d10 6s2 6p4
Electronegativity: 2.0, 1.8
1. Ionization potential: 8.4167 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 4, 2
Electrical conductivity: 0.0219 10^6
Melting point: 254 °C
Boiling point: 962 °C
Specific heat: 0.12 J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.20 W/cmK
Atomic radius: 1.53 Å
Ionic radius: -- Å
Covalent radius: 1.46 Å
Atomic volume: 22.23 cm³/mol
Density (293 K): 9.4 g/cm³
Crystal structure: monoclinic
monoclinic

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
206Po 0 205.981 0 8.8d EC, α View
207Po 0 207 5/2 5.80h EC View
208Po 0 207.981 0 2.898y α, EC View
209Po 0 208.982 1/2 102y α, EC View
210Po 0 209.983 0 138.38d α View
211Po 0 210.987 9/2 0.516s α View
212Po 0 211.989 0 0.298µs α View
213Po 0 212.993 9/2 4µs α View
214Po 0 213.995 0 163.7µs α View
215Po 0 214.999 9/2 1.780ms α, β- View
216Po 0 216.002 0 0.145s α View
218Po 0 218.009 0 3.10m α, β- View

Other info

Name origin:Named for Poland, native country of Marie Curie.
Description:Silvery-gray, extremely rare, radioactive metal.
Discovered by:Pierre and Marie Curie
Year:1898
Place:France
Sources:Occurs in pitchblende from decay of bismuth.
Use(s):Used in industrial equipment that eliminates static electricity caused by such processes as rolling paper, wire, and sheet metal.