- Atomic Radius (Å)
Polonium is a chemical element with symbol Po and atomic number 84, discovered in 1898 by Marie Curie and Pierre Curie. A rare and highly radioactive element with no stable isotopes, polonium is chemically similar to bismuth and tellurium, and it occurs in uranium ores. Applications of polonium are few.
84
Atomic Number
209
Atomic Mass (u)
527.15
Melting Point (K)
1235
Boiling Point (K)
9.2
Density (solid: g/cm³, gas: g/liter)
1.5
Atomic Radius (Å)
1.4
Covalent Radius (Å)
2
Electronegativity
8.42
First Ionization Energy (eV)
136
Electron Affinity
6
Number of Shells
6
Electron Valency
2, 8, 18, 32, 18, 6
Electron Shell Occupations