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

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$E_{2s(H)} > E_{2s(Li)} > E_{2s(Na)} > E_{2s(K)}$

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(A) The energy of an orbital in a multi-electron atom depends on the effective nuclear charge $(Z_{eff})$.As the atomic number $(Z)$ increases,the attraction between the nucleus and the electrons increases,which lowers the energy of the orbital.For the $2s$-orbital,the energy decreases as the nuclear charge increases.The atomic numbers are $H (Z=1)$,$Li (Z=3)$,$Na (Z=11)$,and $K (Z=19)$.Since $Z_{eff}$ increases from $H$ to $K$,the energy of the $2s$-orbital decreases in the order: $E_{2s(H)} > E_{2s(Li)} > E_{2s(Na)} > E_{2s(K)}$.

What is the decreasing order of energy for the $2s$-orbital of $H, Li, Na$,and $K$ atoms?

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