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Account for the following : Mg^(+2) ...

Account for the following :
`Mg^(+2)` is smaller than `O-^(2)` ion although both have same electronic structure . (ii) Ionisation enthalpy of nitrogen is more than that of oxygen .

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(i) It is due to greater nuclear change and greater effective nuclear change in `Mg^(2+) and O^(2-)`
(ii) It is due to stability of electronic configuration of nitrogen.
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