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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.
Examples of elements that have allotropes include carbon, oxygen, phosphorus, and sulfur. Allotropes. Oxygen is a chemical element represented by the symbol 'O' and has the atomic number 8. It is the first element in Group VI A of the modern periodic table.ioxygen. Dioxygen (O 2) is the most common form of elemental oxygen. It is a colorless gas at room temperature and forms about 21% of the earth's atmosphere. It exists as a diradical, and is the only allotrope that has unpaired electrons.