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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.
Noun. 1. allotrope-a structurally different form of an element; graphite and diamond are allotropes of carbon. chemical element, element-any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter.Translations.llotrope-a structurally different form of an element; graphite and diamond are allotropes of carbon.