(3)because... IE 1 in Na is smaller as it only needs to lose 1electron to obtain stability than Mg and so the electron-nuclear attraction of Na is lower than Mg which has more no: of protons...
in case of IE2 Na has already filled its octet and attained stability... but Mg still has 1more electron to give to attain more stability... Hence IE2 of Na is greater...
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(3)because... IE 1 in Na is smaller as it only needs to lose 1electron to obtain stability than Mg and so the electron-nuclear attraction of Na is lower than Mg which has more no: of protons...
in case of IE2 Na has already filled its octet and attained stability... but Mg still has 1more electron to give to attain more stability... Hence IE2 of Na is greater...
Hope it helps...
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