A → A – + e, E 1 and A + → A 2+ + e, E 2 . The energy required to pull out the two electrons are E 1 and E 2 respectively. The correct relationship between two energy would be:
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Consider the following changes:
The energy required to pull out the two electrons are 
and 
respectively.
The correct relationship between two energies would be 
.
The second ionization energy is always higher than the first ionization energy as an electron is to be removed from unipositive cation. There is a strong electrostatic attractive force between the unipositive cation and the electron. This makes the removal of electron difficult and requires a large amount of energy.
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