Question

Assertion :$F$ atom has a less negative electron affinity than $Cl$ atom. Reason: Additional electrons are repelled more effectively by 3p electrons in $Cl$ atom than by 2p electron in $F$ atom.

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

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

In general, the electron affinity decreases down the group but the electron affinity for chlorine is more than that for fluorine, because in F, due to the small size of the atom, the electrons are already crowded. Entry of one more electron results in more repulsion, which leads to absorption of some energy released is less than what is expected.