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-$II$
$(1)$ Active non-metal with high electron gain enthalpy.	$(A)$ $Na$
$(2)$ Soft metal with low ionization enthalpy.	$(B)$ $Sb$
$(3)$ Metalloid that forms ${M_2}{O_3}$ type oxide.	$(C)$ $He$
$(4)$ Chemically inert gas.	$(D)$ $Cl$

Which of the following statements is incorrect?

Similar Questions

Which of the following represents the correct order of ionization enthalpy?
$(i) Ba < Sr < Ca$
$(ii) S^{2-} < S < S^{2+}$
$(iii) C < O < N$
$(iv) Mg < Al < Si$

Which of the following statements is not correct?

The incorrect order of properties for the following is:

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