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The first ionization energy of oxygen is...

The first ionization energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

A

Lesser effective nuclear charge of oxygen than nitrogen

B

lesser atomic size of oxygen than nitrogen

C

greater interelectron repulsion between counter balances the increases in effective nuclear charge on moving from nitrogen to oxygen

D

greater effective nuclear charge of oxygen than nitrogen

Text Solution

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The correct Answer is:
C
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