Which of the following statements is incorrec | vedclass

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(C) $1$. $IP_1$ is the energy required to remove the first electron,and $IP_2$ is the energy required to remove the second electron. Since removing an

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The number of elements in any period is half the number of orbitals available in the corresponding shells.

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(C) $1$. $IP_1$ is the energy required to remove the first electron,and $IP_2$ is the energy required to remove the second electron. Since removing an electron from a cation is harder than from a neutral atom,$IP_2 > IP_1$. Thus,statement $A$ is correct.$2$. For $N$ $(2s^2 2p^3)$ and $O$ $(2s^2 2p^4)$,$IP_1$ order is $N > O$ due to stable half-filled $p$-orbitals. For $IP_2$,the order changes because $O^+$ $(2s^2 2p^3)$ becomes more stable than $N^+$ $(2s^2 2p^2)$. Thus,statement $B$ is correct.$3$. The number of elements in a period is equal to the number of electrons that can be accommodated in the orbitals being filled,which is exactly equal to the number of orbitals multiplied by $2$. The statement says it is half,which is incorrect.$4$. By definition,the ionization potential of an anion $(Cl^-)$ is equal to the electron affinity of the corresponding neutral atom $(Cl)$. Thus,statement $D$ is correct.

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

Which of the following statements is incorrect?

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