Question
Which of the following statements is wrong ?
A.
van der Waal’s 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 gain enthalpy of $$N$$ is almost zero while that of $$P$$ is $$74.3\,kJ\,mo{l^{ - 1}}$$
Answer :
All isoelectronic ions belong to same period of the periodic table
Solution :
In the isoelectronic species, all isoelectronic anions belong to the same period and cations to the next period.