ChemiPlus Logo
Dictionary - Training


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


Name: Polonium Symbol: Po
Group: Metal, Chalcogen 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: ?


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

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:

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


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