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Question

Which of the following pairs of species (atoms/ions) will have identical ground state electronic configuration?

A
Li+ and He
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B
Cl and Ar
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C
Na and K
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D
F+ and Ne
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Solution

The correct option is B Cl and Ar
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, Cland Ar have the same electronic configuration.

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