Compare the difference in 1st and 2nd IP values of sodium and magnesium. Give appropriate reason.

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Solution

1st IP 2nd IP
Na 5.13eV 47.28 eV
Mg 7.6 eV 15.035eV
1st I.P of sodium is less than Mg. Because 'Na' has a single electron whereas 'Mg' has a pair of electrons. The single electron is to be removed easily. So its 1st I.P is less than Mg.
2nd I.P of Sodium is greater than Mg. Because Na $^{+}$ has a noble gas electronic configuration, which is more stable. But Mg $^{+}$ has a single electron which can easily be removed by applying less amount of energy than 'Na' 2nd I.P.

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