The correct order of electron affinity is:

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(B) Electron affinity is the energy released when an electron is added to a neutral gaseous atom. Generally,electron affinity increases across a perio

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$N < O < S < Cl$

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(B) Electron affinity is the energy released when an electron is added to a neutral gaseous atom. Generally,electron affinity increases across a period and decreases down a group. However,due to small size and inter-electronic repulsion,the electron affinity of $O$ is less than $S$,and $N$ has a very low (near zero) electron affinity due to its stable half-filled $2p^3$ configuration. Thus,the correct order is $N < O < S < Cl$.

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