Thallium

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Thallium, THAL ee uhm, is a soft, bluish-gray metallic element that looks like lead. Most thallium comes from iron pyrites, in which traces of the element occur as an impurity. In addition, the element occurs in the minerals crookesite, hutchinsonite, and lorandite. Sir William Crookes, an English scientist, discovered thallium in 1861.

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Thallium

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