Question

Q:-18:- Which of the following statements is incorrect?
(a) I.E.1 of O is lower than that of N but I.E.2 O is higher than that of N
(b) The enthalpy of N to gain an electron is almost zero but of P is 74.3 kJ mol-1
(C) isoelectronic ions belong to the same period
(d) The covalent radius of iodine is less than its Van der Waal's radius
Q:-19:-The correct order of electronegativity is​

Answer 1

Answer:

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Answer 2

Answer:

All isoelectronic ions belong to the same period of the periodic table, is a wrong statement as F

−

and Na

+

are isoelectronic but they belong to different periods.

IE

1

of N is higher than that of O while IE

2

of O is higher than that of N due to stable half filled configuration.

Van der Waal's radius of iodine is more than its covalent radius.

Explanation:

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