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The second ionization energies of elements are always higher than their first ionization energies because:

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it is easier to remove electron from cation

cation formed always have stable half filled or completely filled valence shell electron configuration

ionization is an endothermic process

the cation is smaller than its parent atom

answer is A.

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Detailed Solution

First ionisation energy is when an electron is removed from a neutral atom. Second ionisation energy is when an electron is removed from a positive atom, where electrons are more securely linked due to a stronger attraction force.

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