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Corrected:

No: When it is a halogen!!

Yes:

They are 'made' of one anionic atom: it is for salts of negatively charged, non-metal and mono-elemental ions.

Simplier said: they are negative, single ions of non-metals

Examples:

Cl- chloride, S2- sulfide, N3- nitride, C4- carbide, and of course last but not least: oxide with O2-.

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Related Questions

When does the en d of a name of a negative ion end in ide?

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