Sodium forms Na+ ion but it does not form Na2+ because
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a
very low value of (IE)1 and (IE)2
b
very high value of (IE)1 and (IE)2
c
low value of (IE)1 and low value of (IE)2
d
low value of (IE)1 and high value of (IE)2
answer is D.
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Detailed Solution
Sodium has one valence electron. Sodium forms Na+ ion by losing its valence electron and attains the stable electronic configuration of Ne with completed octet. This requires less amount of energy. The removal of the second electron will break this stable electronic configuration and requires high amount of energy.