Thallium is a chemical element denoted by the symbol Tl It has the atomic number 81. It is a soft, malleable and gray post-transition metal which does not occur naturally as a free metal. It forms its oxides in two different oxidation states, +1 and +3. The compounds with oxidation state +1 resemble the corresponding potassium or silver compounds. The compounds with oxidation state +3 resemble the corresponding aluminium(III) compounds.

Thallium is a chemical element denoted by the symbol Tl It has the atomic number 81. It is a soft, malleable and gray post-transition metal which does not occur naturally as a free metal. It forms its oxides in two different oxidation states, +1 and +3. The compounds with oxidation state +1 resemble the corresponding potassium or silver compounds. The compounds with oxidation state +3 resemble the corresponding aluminium(III) compounds.


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