Which of the following statements is incorrect?

  • I.E.1 of O is lower than that of N but I.E.2 O is higher than that of N
  • The enthalpy of N to gain an electron is almost zero but of P is 74.3 kJ mol-1
  • isoelectronic ions belong to the same period
  • The covalent radius of iodine is less than its Van der Waal’s radius
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