Exercise 3 on Cations and Anions of an Isoelectronic Series

Question: Which of the following is an isoelectronic series?

  1. F−, Cl−, Br−, I
  2. O2−, F−, Ne, Na+
  3. Si2 −, P2−, S2−, Cl2−
  4. S, Cl, Ar, K
  5. B5−, Si4−, As3−, Te2−


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