Which one of the following is not an iso-electronic pair?

Which one of the following is not an iso-electronic pair?
  1. $\mathrm{Mg}^{2+}, \mathrm{C}^{4-}$
  2. $\mathrm{N}^{3-}, \mathrm{O}^{2-}$
  3. $\mathrm{N}^{2-}, \mathrm{O}^{2-}$
  4. $\mathrm{F}^{-}, \mathrm{Al}^{3+}$

Solution

No Solution Available

Asked in: AP EAMCET 2002

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