Thallium - ț̢
A heavy, soft, bluish white metal, atomic number 81, atomic weight 204.37, symbol Tl. (From Dorland, 28th ed)
Synonyms :
Thallium Radioisotopes - ț̢
Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes.