Template:Infobox polonium

Polonium,  ₈₄Po

Template:Infobox element/symbol-to-top-image-caption
General properties
Pronunciation	Template:Infobox element/pronunciation
Allotropes	α, β
Appearance	silvery
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Polonium in the periodic table
Template:Infobox element/periodic table
Atomic number (Z)	84
Group	Template:Infobox element/group
Period	period 6
Block	p-block
Element category	Template:Infobox element/category format, but this status is disputed
Electron configuration	[Xe] 4f14 5d10 6s2 6p4
Electrons per shell	2, 8, 18, 32, 18, 6
Physical properties
Phase at STP	solid
Melting point	527 K ​(254 °C, ​489 °F)
Boiling point	1235 K ​(962 °C, ​1764 °F)
Density (near r.t.)	alpha: 9.196 g/cm3 beta: 9.398 g/cm3
Heat of fusion	ca. 13 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	102.91 kJ/mol
Molar heat capacity	26.4 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.0
[[Ionization energy|Template:Engvar energies]]	1st: 812.1 kJ/mol
Atomic radius	empirical: 168 pm
Covalent radius	140±4 pm
Van der Waals radius	197 pm
Template:Infobox element/spectral lines
Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure α-Po
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure β-Po
Thermal expansion	23.5 µm/(m·K) (at 25 °C)
Thermal conductivity	20 W/(m·K) (?)
Electrical resistivity	α: 0.40 µΩ·m (at 0 °C)
Magnetic ordering	nonmagnetic
CAS Number	7440-08-6
History
Naming	after Polonia, Latin for Poland, homeland of Marie Curie
Discovery	Pierre and Marie Curie (1898)
First isolation	Willy Marckwald (1902)
Main isotopes of polonium
Template:Infobox element/isotopes table