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Template:Infobox polonium

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Polonium, 84Po
Template:Infobox element/symbol-to-top-image-alt
Polonium
PronunciationTemplate:Infobox element/pronunciation/format
Allotropesα, β
Appearancesilvery
Mass number[209]
Polonium in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
Te
↑
Po
↓
Lv
bismuth ← polonium → astatine
Atomic number (Z)84
Groupgroup 16 (chalcogens)
Periodperiod 6
Block  p-block
Electron configuration[Xe] 4f14 5d10 6s2 6p4
Electrons per shell2, 8, 18, 32, 18, 6
Physical properties
Phase at STPsolid
Melting point527 K ​(254 °C, ​489 °F)
Boiling point1235 K ​(962 °C, ​1764 °F)
Density (near r.t.)α-Po: 9.196 g/cm3
β-Po: 9.398 g/cm3
Heat of fusionca. 13 kJ/mol
Heat of vaporization102.91 kJ/mol
Molar heat capacity26.4 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) (846) 1003 1236
Atomic properties
Oxidation statescommon: −2, +2, +4
+5[1] +6,[2]
ElectronegativityPauling scale: 2.0
Ionization energies
  • 1st: 812.1 kJ/mol
Atomic radiusempirical: 168 pm
Covalent radius140±4 pm
Van der Waals radius197 pm
Color lines in a spectral range
Spectral lines of polonium
Other properties
Natural occurrencefrom decay
Crystal structure ​cubic
α-Po
Crystal structure ​rhombohedral
Rhombohedral crystal structure for polonium

β-Po
Thermal expansion23.5 µm/(m⋅K) (at 25 °C)
Thermal conductivity20 W/(m⋅K) (?)
Electrical resistivityα-Po: 0.40 µΩ⋅m (at 0 °C)
Magnetic orderingnonmagnetic
CAS Number7440-08-6
History
Namingafter Polonia, Latin for Poland, homeland of Marie Curie
DiscoveryPierre and Marie Curie (1898)
First isolationWilliam H. Beamer and Charles R. Maxwell (1946)
Isotopes of polonium
Main isotopes[3] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
206Po synth 8.8 d β+94.5% 206Bi
α5.45% 202Pb
208Po synth 2.898 y α 204Pb
β+<0.01% 208Bi
209Po synth 124 y α99.5% 205Pb
β+0.454% 209Bi
210Po trace 138.376 d α 206Pb
 Category: Polonium
| references

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References

  1. ↑ Thayer, John S. (2010). "Relativistic Effects and the Chemistry of the Heavier Main Group Elements". Relativistic Methods for Chemists. Challenges and Advances in Computational Chemistry and Physics. Vol. 10. p. 78. doi:10.1007/978-1-4020-9975-5_2. ISBN 978-1-4020-9974-8.
  2. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
  3. ↑ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.