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Those ions are

  1. all anions,
  2. negatively charged (mainly) -1, -2 or -3,
  3. consisting of one nonmetal element (mainly group 17, 16 or 15 respectively)

    and

  4. not containg oxygen.

Examples:

17: F- , Cl- , Br- , I- (fluoride, chloride, bromide, iodide)

16: O2-(oxide), S2-(sulfide)

15: N3- (nitride), P3- (phosphide)

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