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Polonium


6
84
208.9824
KEY
Chemical Element Symbol Key

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Polonium
Columbia Encyclopedia
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Symbol: Po
Atomic Number: 84
Atomic Weight: 208.9824
Element Classification: Semimetallic
Discovered By: Pierre and Marie Curie-Sklodowska
Discovery Date: 1898 (France/Poland)
Name Origin: Named for Poland, native country of Marie Curie.
Density (g/cc): 9.32
Melting Point (K): 527
Boiling Point (K): 1235
Appearance: Silvery-gray metal
Atomic Radius (pm): 176
Atomic Volume (cc/mol): 22.7
Covalent Radius (pm): 146
Ionic Radius: 67 (+6e)
Specific Heat (@20°C J/g mol): 0.125
Fusion Heat (kJ/mol): (10)
Evaporation Heat (kJ/mol): (102.9)
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 2.0
First Ionizing Energy (kJ/mol): 813.1
Oxidation States: 6, 4, 2
Electronic Configuration: [Xe] 4f14 5d10 6s2 6p4
Lattice Structure: Simple Cubic (SC
Lattice Constant (Å): 3.350
Lattice C/A Ratio: n/a


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