In which of the following sets,elements are n | vedclass

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(D) Electron gain enthalpy: In a group,electron gain enthalpy generally decreases down the group,but for $p$-block elements,the $EA_1$ of the second p

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$Na > K > Ba$ (Metallic nature)

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(D) Electron gain enthalpy: In a group,electron gain enthalpy generally decreases down the group,but for $p$-block elements,the $EA_1$ of the second period element is less than that of the third period element due to smaller size and inter-electronic repulsion. Thus,the order is $S > Se > O$ (Correct).Electronegativity: Across a period,it increases,and down a group,it decreases. The order $F > O > Cl$ is correct.Metallic radius: It decreases from left to right and increases from top to bottom. The order $Na > Li > Al$ is correct.Metallic character: It increases down the group. Therefore,the order should be $Ba > K > Na$. The given set $Na > K > Ba$ is incorrect.

$A. S \rightarrow S^{-}$	$P. \text{Endothermic process}$
$B. N^{-} \rightarrow N$	$Q. \text{Exothermic process}$
$C. O^{-} \rightarrow O^{2-}$	$R. \text{Inert gas configuration in product}$
$D. P \rightarrow P^{-}$	$S. \text{Half filled configuration in product}$

In which of the following sets,elements are not correctly arranged with the property shown in brackets?

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