Polonium (Po) is a soft, gray, radioactive, metallic element of group VIA of the periodic table,
discovered in 1898 by Marie Curie. It
is found in trace amounts in uranium ores
and may also be synthesized by neutron bombardment
of bismuth. The commonest isotope, 210Po, emits alpha particles (half-life 138.4 days), and is used in neutron sources; the most stable
isotope is 209Po.
|Polonium atom. Source: