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Question

The enery of loss of an electron from Ne and Na+ ion(both isoelectronic) are:

A
4562 kJ mol1, 2081 kJ mol1
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B
2081 kJ mol1, 4562 kJ mol1
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C
2081 kJ mol1 each
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D
4562 kJ mol1 each
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Solution

The correct option is B 2081 kJ mol1, 4562 kJ mol1
2081KJ/mol 4562KJ/mol
1) both are stable & have their outer most e in same shell.
2) energy require Na+ ion is more
it contain one more proton in its nucleus which pulls outer most e more properly than Ne.
for this we didn't need to remember its value just get an idea from options.

1094494_1029397_ans_75c73980494a4e2e9033509e058dec88.png

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