Test Academy | 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, The covalent radius of iodine is less than its Van der Waal’s radius, isoelectronic ions belong to the same period

Question

Which of the following statements is incorrect?

Options :

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
The covalent radius of iodine is less than its Van der Waal’s radius
isoelectronic ions belong to the same period

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