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Taxpayer Identification Number (TIN): Overview What is a TIN? A Taxpayer Identification Number (TIN) is required by the federal government for reporting purposes. A TIN can be a Social Security Number (SSN) or an Individual Taxpayer Identification Number (ITIN). A valid TIN can have only 9 numbers.
Tin is a chemical element with the symbol Sn (for Latin: stannum) and atomic number 50. It is a main group metal in group 14 of the periodic table. Tin shows a chemical similarity to both neighboring group-14 elements, germanium and lead, and has two possible oxidation states, +2 and the slightly more stable +4.in is the 49th most abundant element and has, with 10 stable isotopes, the largest number of stable isotopes in the periodic table. It is a silvery, malleable other metal that is not easily oxidized in air, obtained chiefly from the mineral cassiterite where it occurs as tin dioxide, SnO 2.