JEE CHEMISTRY MCQ: STRUCTURE OF ATOM

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Energies of 2S orbital in IA group is

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Correct option: A

{E_{2s}}\left( H \right) > {E_{2s}}\left( {Li} \right) > {E_{2s}}\left( {Na} \right) > {E_{2s}}\left( K \right)

Option A is correct because as the atomic number increases down the group, the energy of the 2s orbital decreases due to increased nuclear charge and shielding.

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