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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 exhibits the oxidation states +2 and +4, like lead. In the +2 state, it is basic and behaves like a metal. In the +4 state, it is amphoteric and can behave in an acidic manner in alkaline solution. The oxidation state +2 is called stannous, and the +4 state is called stannic.