81

Tl

Thallium
114.818 (3)
 Historical Information

Thallium was discovered spectroscopically in 1861 by Crookes. The element was named after the green spectral line, which identified the element (Greek "thallos", green twig).
Basic Information Shells
  • Name:Thallium
  • Symbol: Tl
  • Atomic number: 81
  • Atomic weight: 114.818 (3)
  • Standard state: solid at 298 K
  • Group in periodic table:13
  • Group name: none
  • Period in periodic table: 6
  • Block in periodic table: p-block
  • Classification: Metallic
 Thallium
Uses Trivia
  • the sulphate was widely used as a rodenticide and ant killer. It is odourless and tasteless, giving no warning of its presence

The element and its compounds are toxic and should be handled carefully. Thallium may cause cancer. When freshly exposed to air, thallium exhibits a metallic lustre, but soon develops a bluish-grey tinge, resembling lead in appearance.