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) of N is higher than that of O while of O is higher than that of N
(d) The electron affinity N is almost zero while that of P is 74.3 kJ
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