Rank these elements according to first ionization energy. Highest ionization ene

Question

Rank these elements according to first ionization energy. Highest ionization energy Kr Br Se As Ge Ga Ca Incorrect. You have correctly identified the general trend, with the noble gas at the top and the alkali metal at the bottom However, there are two exceptions within this general rend. The atom with the ns2 electron configuration is particularly stable and should move up one spot in the ranking. Similarly, the atom with the ns np3 electron configuration is particularly stable and should move up one spot in the ranking. Lowest ionization energy

Explanation / Answer

Highest ionization enthalpy

Kr

Br

As

Se

Ge

Ca

Ga

K

Lowest ionization enthalpy

The calcium has higher first ionization enthalpy than gallium, as the electron has to be removed from 4s2 orbital which is completely filled requires more energy. On the contrary gallium removal of electron is from 3p1, which on removal provides a completely filled orbital state which is more stable, thus require less energy

Similarly in As has higher ionization enthalpy as the electron is removed from half filled orbitals, which requires more energy

Thus half filled n completely filled state requires more energy to remove an electron.

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