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First ionisation enthalpy off Na is less...

First ionisation enthalpy off Na is less than that of Mg, but second ionisation enthalpy of Na is higher than that of Mg. explain.

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By long an electron from its outer most shell, Na attains the stable electronic configuration of the nearest noble gas Ne, So, the first ionisation enthalpy of Na is less than Mg, On the other hand, removal of one electron from the outermost shell of `Mg^(+1)` leads to the sttainment of the stable electronic configuration of Ne. so the second ionisation enthalpy of Mg is less than that of Na.
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