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1 Allotropes are forms of the same element which exhibit different physical properties. 2  Elements such as carbon, oxygen, phosphorus, tin and sulfur, display allotropy.
Tin (Sn), atomic number 50, atomic weight 118.70, is a member of column IVA of the periodic table, five elements whose outer electron configuration is s2p2. Its mates are carbon (C), silicon (Si), germanium (Ge) and lead (Pb). These elements are remarkable in that they are commonly used in the pure form.