The correct order of energy of 2s-orbitals in | vedclass

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

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$K < Na < Li < H$

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(A) The energy of an orbital in a hydrogen-like species depends on the effective nuclear charge $(Z_{eff})$. As the atomic number $(Z)$ increases,the attraction between the nucleus and the electrons increases,which leads to a decrease in the energy of the orbital (making it more negative). 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 $Z$ increases in the order $H Therefore,the correct order of energy is $K < Na < Li < H$.

The correct order of energy of $2s$-orbitals in $H$,$Li$,$Na$ and $K$ is:

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