When the electrons are successively filled in the orbitals of same shell, orbital, which is filled at the end, requires less energy to remove electron. Justify.

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Solution

Ionization enthalpy is the minimum amount of energy required to remove the most loosely attached electron from an isolated gaseous atom in order to transform it into a gaseous cation.
Because the distance between the outermost electron and the nucleus increases as we proceed down the periodic table, ionization energy reduces.
As the force of attraction between the outermost electron and the nucleus decreases, it becomes easier to remove one electron as we progress down the periodic table.
A similar thing happens in the orbital, which is eventually filled.

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