Which of the following statements is incorrec | vedclass

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(A) The electronic configuration of $Se$ $(Z=34)$ is $[Ar] 3d^{10} 4s^2 4p^4$. The second ionisation energy involves removing an electron from $Se^+$.

Vedclass · Accepted Answer

The second ionisation energy of $Se$ is greater than the second ionisation energy of $As$.

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(A) The electronic configuration of $Se$ $(Z=34)$ is $[Ar] 3d^{10} 4s^2 4p^4$. The second ionisation energy involves removing an electron from $Se^+$. Since $As$ $(Z=33)$ has a stable half-filled $4p^3$ configuration,removing the second electron from $As^+$ is harder than from $Se^+$. Thus,the statement is incorrect.$(b)$ $C^{2+}$ has a stable $2s^2$ configuration,making its ionisation energy higher than $N^{2+}$ $(2p^1)$.$(c)$ $F^{2+}$ has a stable $2p^3$ half-filled configuration,making its third ionisation energy higher than $O^{2+}$ $(2p^2)$.$(d)$ Noble gases,not halogens,have the highest $I.E.$ in their respective periods due to their stable octet configuration.

Which of the following statements is incorrect?

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