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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.
Exactly this same structure is found in silicon and germanium and in one of the allotropes of tin - grey tin or alpha-tin. The common allotrope of tin (white tin or beta-tin) is metallic and has its atoms held together by metallic bonds. The structure is a distorted close-packed arrangement.