Period 5 element corrosion-resistant tin plating of steel. Because of its low toxicity, tin-plated metal is also used for food packaging, giving the name to tin cans, which are made mostly of steel. Antimony () is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite (SbS). Antimony compounds have been known since ancient times and were used for cosmetics, metallic antimony was also known but mostly identified as lead. For some time China has been the largest producer of antimony and its compounds,
Power residue symbol Hilbert symbol formula_24 for the prime formula_4 by in the case formula_4 coprime to "n", where formula_28 is any uniformising element for the local field formula_29. The formula_14-th power symbol may be extended to take non-prime ideals or non-zero elements as its "denominator", in the same way that the Jacobi symbol extends the Legendre symbol. Any ideal formula_31 is the product of prime ideals, and in one way only: The formula_14-th power symbol is extended multiplicatively: For formula_35 then we define where formula_37 is the principal ideal generated by formula_38 Analogous to the quadratic Jacobi symbol, this symbol is multiplicative