Question

why the ionization enthalpy of grp2 greater than group 3?
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Answer 1

General electronic configuration of group 1 elements is ns1. It is a half filled electronic configuration. General electronic configuration of group 2 elements is ns2. It is a full filled electronic configuration. Full filled electronic configurations are more stable than half filled electronic configurations. So, they cannot lose their stability easily. So, we should provide more energy to the atom with full filled electronic configuration than the atom with half filled electronic configuration to remove it's electron from the outer most shell.

Therefore, Group 2 elements have greater ionisation energy than Group 1 elements due to their stability.

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Answer 2

Answer:

because elements of group 3 have 3 valence electrons so it is easier to remove an electron because of less effective nuclear charge and in group 2 only 2 valence electrons are there so it is difficult to remove an electron from the outermost shell.