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Give the reasons of the following : ...

Give the reasons of the following :
First ionization enthalpy of Mg is more than that of Na but second ionization enthalpy of Mg is less than that of Na .

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First ionization energy of Mg is more than that of Na because it has smaller atomic size but `2^(nd)` ionization of Mg is less because after losing one electron sodium acquires nearest noble gas configuration.
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