Bismuth

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Bismuth is the chemical element with the symbol Bi and the atomic number of 83. It is a pentavalent post-transition metal and it is a pnictogen which resembles the lighter homologs arsenic and antimony.

Elemental bismuth can occur in nature, but it's oxide and sulfide forms are used industrially. It's pure form is 86% as dense as lead, and it is a brittle metal with a silvery-white color when freshly produced, but it oxidizes into a pink tinge. It is mildly radioactive and it is the most diamagnetic element, and it is the least thernally conductive metal on the periodic table.

Humans have often confused it with lead and tin, albeit it was known during ancient times. it's entomology is uncertain, but the Arabs said it had a similar property to antimony.