Any of two or more forms of the same chemical element. They may have different arrangements of atoms in crystals of the solidfor example, graphite and diamond for carbonor different numbers of atoms in their moleculesfor example, ordinary oxygen (O) and ozone (O). Other elements that have allotropes include tin, sulfur, antimony, arsenic, selenium, and phosphorus.
This entry comes from Encyclopædia Britannica Concise.For the full entry on allotrope, visit Britannica.com.
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