(B) Statement $(b)$ is wrong. Isoelectronic species are ions or atoms that have the same number of electrons. These species do not necessarily belong

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All isoelectronic ions belong to same period of the periodic table

(B) Statement $(b)$ is wrong. Isoelectronic species are ions or atoms that have the same number of electrons. These species do not necessarily belong to the same period. For example,$O^{2-}$ $(10 \ e^-)$ belongs to the $2^{nd}$ period,while $Na^+$ $(10 \ e^-)$ also belongs to the $3^{rd}$ period. Thus,isoelectronic ions can belong to different periods.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Mix Examples - Classification of Elements and Periodicity in Properties

Difficult

Which of the following statements is/are wrong?

A
van der Waals' radius of iodine is more than its covalent radius
B
All isoelectronic ions belong to same period of the periodic table
C
$I.E._1$ of $N$ is higher than that of $O$ while $I.E._2$ of $O$ is higher than that of $N$
D
The electron affinity of $N$ is almost zero while that of $P$ is $74.3 \ kJ \ mol^{-1}$