Name: polonium
Symbol: Po
Atomic number: 84
Atomic weight: [ 209 ]
Group in periodic table: 16
Group name: Chalcogen
Period in periodic table: 6
Block in periodic table: p-block
CAS registry ID: 7440-08-6
Polonium has more isotopes than any other element, all of which are radioactive. Polonium dissolves readily in dilute acids, but is only slightly soluble in alkalis.
Weight for weight it is about 2.5 x 1011 times as toxic as hydrocyanic acid (HCN). Polonium has been found in tobacco as a contaminant and in uranium ores.