Polonium
Chemical element
Polonium is a chemical element; it has symbol Po and atomic number 84. A rare and highly radioactive metal with no stable isotopes, polonium is a chalcogen and chemically similar to selenium and tellurium, ... Wikipedia
Symbol: Po
Discoverers: Marie Curie and Pierre Curie
Atomic number: 84
Atomic mass: 209 u
Discovered: 1898
Electrons per shell: 2,8,18,32,18,6
Electron configuration: [Xe] 6s2 4f14 5d10 6p4