Thallium

Atomic Number: 81
Symbol: Tl
Atomic Mass: 204.38 u
Number of Neutrons: 123
Melting Point: 304°C
Boiling Point: 1473°C
Electrons per shell: 2.8.18.32.18.3
Electron configuration: [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹

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Thallium is the 81st element in the periodic table and it is one of the post-transition metals. It is a gray metal that when isolated, resembles tin, but changes color when exposed to air. Thallium is used in the production of electronic devices such as phones. Thallium is highly toxic and poisonous that can affect your nervous system, lung, heart, liver, and kidney. Thallium is found in the ground in ores and minerals such as crooksite, lorandite and hutchinsonite. British chemist William Crookes discovered thallium in 1861. The name Thallium comes from the Greek word 'thallos', meaning a green twig.

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