Periodic Table of the Elements: Thallium

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Periodic Table of the Elements: Thallium
Atomic Number:81
Atomic Symbol:Tl
 Thalliumthallium
, metallic chemical element; symbol Tl; at. no. 81; interval in which at. wt. ranges 204.382–204.385; m.p. 303.5&degC;; b.p. about 1,457&degC;; sp. gr. 11.85 at 20&degC;; valence +1 or +3.
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Atomic Weight:[204.382; 204.385]
Electron Configuration:2 · 8 · 18 32 · 18 · 3