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If a pure [[element]] can form several physically and chemically different substances, it can form '''allotropes'''. The most famous is [[carbon]], which has four allotropes, although [[phosphorus]], [[oxygen]], [[sulphur]], and [[plutonium]] can also form allotropes (3,3,4, and 7 respectively).
If a pure [[element]] can form several physically and chemically different substances, it can form '''allotropes'''. For example, O<sub>2</sub> and O<sub>3</sub> are allotropes of oxygen.
The most famous element that can form allotropes is [[carbon]], which can form four. The following elements can also form allotropes: [[phosphorus]] (3), [[oxygen]] (3), [[sulphur]] (4), and [[plutonium]] (7).
[[Category:Chemistry]]
[[Category:Chemistry]]