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Which of the following statements is wrong ?

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The electron gain enthalpy of N is almost zero while that of P is 74.3KJmol^-1

IE₁ of N is higher than that of O while IE₂ of O is higher than that of N

van der Waal’s radius of iodine is more than its covalent radius

All isoelectronic ions belong to same period of the periodic table

answer is B.

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Detailed Solution

In the isoelectronic species, all isoelectronic anions belong to the same period and cations to the next period.

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