Identify the set of elements in which they ar | vedclass

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Question

(A) The electron gain enthalpy becomes more negative as we move from left to right across a period and becomes less negative as we move down a group.

Vedclass · Accepted Answer

$O < S < F < Cl$

Vedclass · Answer

(A) The electron gain enthalpy becomes more negative as we move from left to right across a period and becomes less negative as we move down a group. However,due to small size,the electron-electron repulsion in $F$ and $O$ makes their electron gain enthalpies less negative than those of $Cl$ and $S$ respectively. The order of increasing electron gain enthalpy (more negative value means lower enthalpy) is: $O Thus,the correct order is $O < S < F < Cl$.

Identify the set of elements in which they are arranged in the increasing order of electron gain enthalpies.

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