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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 N is almost zero while that of P is 74.3 kJ $mo{l}^{-1}$