General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Polonium Symbol Po
atomic number 84 Atomic weight (209)
Density @ 293 K 9.4 g/cm3 Atomic volume 22.23 cm3/mol
Group Metal, Chalcogen discovered 1898


state (s, l, g) s
melting point 527.2 K boiling point 1235 K
Heat of fusion ? Heat of vaporization ?
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1st ionization energy 812 kJ/mole electronegativity 2
2nd ionization energy kJ/mole electron affinity 180 kJ/mole
3rd ionization energy kJ/mole Specific heat 0.12 J/gK
heat atomization 144 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,32,18,6 electron configuration [Xe] 4f14 5d10 6s2 6p4
minimum oxidation number -2 maximum oxidation number 6
min. common oxidation no. -2 max. common oxidation no. 4
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Appearance & Characteristics

structure special: simple cubic color blue glow
uses thermoelectric power toxicity
hardness mohs characteristics Radioactive; 2 forms


reaction with air mild, = PoO2 reaction with 6M HCl mild, = PoCl2
reaction with 6M HCl mild, = PoCl2 reaction with 15M HNO3
reaction with 6M NaOH
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Other Forms

number of isotopes 1 hydride(s)
oxide(s) PoO PoO2 chloride(s) PoCl2 PoCl4


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 168 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 6.8 A^3


source pitchblende, synthetic rel. abund. solar system log
abundance earth's crust -9.7 log cost, pure $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.