Assertion : $I E_{1}$ of nitrogen is lower than $I E_{1}$ of oxygen. Reason: Across a period, effective nuclear charge decreases.

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
$I E_{1}$ of nitrogen is higher than that of $I E_{1}$ of oxygen due to the removal of an electron from half-filled stable orbital from nitrogen, $2 p^{3} (_{7} N = 1 s^{2} 2 s^{2} 2 p^{3})$ .

Across a period, the effective nuclear charge increases with increase in atomic number because electrons enter in the same shell.

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