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.

List-$I$	List-$II$
$A$. $Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$	$I$. Ionisation Enthalpy
$B$. $B < C < O < N$	$II$. Metallic character
$C$. $B < Al < Mg < K$	$III$. Electronegativity
$D$. $Si < P < S < Cl$	$IV$. Ionic radii

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

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If the period number and group number of any representative element are the same,then which of the following statements is incorrect regarding such type of element in its ground state? (Period number and group number are according to the modern form of the periodic table)

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