Stable isotope Polonium (Po)

Isotope Atomic Mass Half-life Mode of Decay Nuclear Spin Nuclear Magnetic Moment
Po-206 205.98047 8.80 days EC to Bi-206; α to Pb-202 0 No data available
Po-207 206.98158 5.80 hours EC to Bi-207; α to Pb-203 5/2 0.79
Po-208 207.98123 2.898 years EC to Bi-208; α to Pb-204 0 No data available
Po-209 208.982404 125.3 +/- 3.2 years EC to Bi-209; α to Pb-205 1/2 1.77
Po-210 209.98286 138.38 days α to Pb-206 0 No data available
 

Properties of Polonium

Name Polonium
Symbol Po
Atomic number 84
Atomic weight 209.0
Standard state Solid at 298 °K
CAS Registry ID 7440-08-6
Group in periodic table 16
Group name Chalcogen
Period in periodic table 6
Block in periodic table p-block
Color Silvery
Classification Metallic
Melting point 254 °C
Boiling point 962 °C
Thermal conductivity 20 (estimated) W/(m·K)
Electrical resistivity 40 x 10-8 Ω·m
Electronegativity 2.0
Heat of vaporization About 100 kJ·mol-1
Heat of fusion About 13 kJ·mol-1
Density of solid 9.20 g/cm3 (alpha form)
Electron configuration [Xe]4f145d106s26p4
Atomic radius 1.64 Å
Atomic volume 23.53 cm3/g-atom
Oxidation states -2, 0, +2, +4, +6