In which of the following,elements are arrang | vedclass

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Question

(A) The electron gain enthalpy generally becomes more negative (increases in magnitude) from left to right across a period and decreases down a group.

Vedclass · Accepted Answer

$F > S > O > N$

Vedclass · Answer

(A) The electron gain enthalpy generally becomes more negative (increases in magnitude) from left to right across a period and decreases down a group. However,elements of the $2^{nd}$ period have very small atomic sizes,which leads to significant inter-electronic repulsion when an electron is added. Due to this,the electron gain enthalpy of $O$ and $N$ is less negative than that of the corresponding elements in the $3^{rd}$ period ($S$ and $P$). Fluorine $(F)$ has the highest electron gain enthalpy among these. Comparing $S$,$O$,and $N$,the order is $S > O > N$. Therefore,the correct order is $F > S > O > N$.

In which of the following,elements are arranged in the correct order of their electron gain enthalpies?

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