Among the following,the energy of 2s orbital | vedclass

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(A) The energy of an orbital in a multi-electron system depends on the effective nuclear charge $(Z_{eff})$. As the nuclear charge $(Z)$ increases,the

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$K$

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(A) The energy of an orbital in a multi-electron system depends on the effective nuclear charge $(Z_{eff})$. As the nuclear charge $(Z)$ increases,the attraction between the nucleus and the electrons increases,which stabilizes the orbital and lowers its energy. Among the given elements,the atomic numbers are: $H$ $(Z=1)$,$Li$ $(Z=3)$,$Na$ $(Z=11)$,and $K$ $(Z=19)$. Since $K$ has the highest nuclear charge $(Z=19)$,the $2s$ orbital in $K$ experiences the strongest attraction,resulting in the lowest energy.

Among the following,the energy of $2s$ orbital is lowest in

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