Chemistry

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Which of the following species are isoelectronic? Select all that apply.

1) S^2-
2) Be^2+
3) Cl^-
4) K^+
5) Ca^2+
6) Se^2-

  • Chemistry -

    Answered below.

  • Chemistry -

    So far I have S^2-, Cl^-, K^+, and Ca^2+ instead the other two as the answer. Please tell me if I have these answers correct.

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