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The concept of homonuclear molecules is closely related to that of allotropes - allotropes are different chemical forms of the same element (not containing any other element), and many elements have multiple allotropic forms. All allotropes are by definition homonuclear, however the designation as homonuclear molecule is normally reserved for the chemical forms that form discrete molecules - allotropes that take the form of e.g. metallic or network solids are normally excluded. For example:
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