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In these elements Na,Mg,Si and P would have the greatest difference b/w the first and second ionisation enthalpies is

a) Na
b) Mg
c) Si
d) P


It may be Mg because it maximum amount of I.E x_{2} compared to other options.
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In the periodic table greatest ionization energy is of noble gasses.
when 1 electron is removed from Na we get noble gas configuration when we remove second electron we need to heigh for Na difference between first and second ionization enthalpies is greatest.
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