Which of the following pair of atoms/atom ions having identical ground state configuration

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${Li}^{+}$ and ${He}^{+}$

${Cl}^{-}$ and $Ar$

Na and K

$F^{+}$ and Ne

answer is A.

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Detailed Solution

Species with the same number of electrons will have identical electronic configuration.
Li⁺ = 1s² and He⁻ = 1s²2s¹
Cl− = 1s² 2s² 2p⁶ 3s² 3p⁶
Ar=1s² 2s² 2p⁶ 3s² 3p⁶
Na=1s²2s²2p⁶3s¹
K=1s²2s²2p⁶3s²3p⁶4s¹
F+ = 1s²2s²2p⁴
Ne=1s²2s²2p⁶

Hence, Cl⁻and Ar have the same electronic configuration.

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