Periodic Table of the Elements
Periodic Table




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name Thallium
latin Thallium
french Thallium
german Thallium
symbol Tl
proton number 81
atomic weight 204.3833
Pauling electronegativity 1.62
electronic configuration [Xe] 4f145d106s26p1
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melting point 577 K, 304°C, 579°F
boiling point 1746 K, 1473°C, 2683°F
group 13
period 6
state (by 20°C) solid
oxidation states +1, +3
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Year of discovery Discoverer
1861 Sir William Crookes (1832-1919)

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