Which one of the following pairs of atoms/ions have identical ground s

1.	Which one of the following pairs of atoms/ions have identical ground state configurations ?
Answer» `Li^+and He^+` `CL^- and AR` `NA and K ` `F^+ and Ne` SOLUTION :`Cl^(-1)` has configuation as argon `Ar = 3s^2 3p^6`

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