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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). Etymology: AS. a whitish metallic element. Its atomic number is 50; its atomic mass is 118.69. Tin (IV) oxide is used in dentistry as a polishing agent for teeth and in some restorative procedures.See also stannous fluoride. metallic element (atomic number 50; atomic weight 118.71) present in trace amounts in nature; it has been linked to deficiency states in some plants and animals, but has no known physiological rule in humans.