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 \[74.3\text{ }kJ\text{ }mo{{l}^{-1}}\]
Correct Answer: B
Solution :
[b] In the isoelectronic species, all isoelectronic anions belong to the same period and, cations to the next period.
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