Question

Why ionisation enthalpy of group ii is greater than group 1?

Answer 1

because of nuclear. attractions

Answer 2

In Group 1, valence shell of atom of element have only one unpaired electron, so they can easily loose electron...

while In Group 2 , valence shell of atom of element contain paired electron, so they need more energy to loose it... so the IE is greater for group 2 than group 1

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