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Polonium
SEE PERIODIC TABLE
SEE FULL ARTICLE
Atomic Number
84
Atomic
Symbol
Po
Atomic Weight
[209 amu]
Group
Metalloid, 16
Form
Solid
Density
@
STP
9.20 g/cm
3
Melting Point
254 °C (489.2 °F, 527.15 °K)
Boiling Point
962 °C (1763.6 °F, 1235.15 °K)
Heat of Fusion
13 kJ/mol (approx.)
Heat of Vaporization
100 kJ/mol (approx.)
First
Ionization Potential
8.41671 eV
Electronegativity
(on
Pauling scale
2.0
Ground State
Electron Configuration
5d
10
6s
2
6p
4
Oxidation State(s)
+2, +4
Selected
Radioisotopes
209
Po,
210
Po
Atomic Radius
135 pm
Crystal Structure
Cubic
Discovered by
Marie Curie, 1898
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