Question

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

Answer 1

Answer:

(c) Isoelectronic ions belong to the same period.

Explanation:

It is not necessary for isoelectronic ions to belong to the same period.

Hope this answer was helpful.

Answer 2

The incorrect statements is the (C) isoelectronic ions belong to the same period.

Explanation:

ISOELECTRONIC IONS:

        Isoelectronic ions are known as atoms or ions that have the same number of electrons. Atoms are the  having the equal numbers of electrons are called the isoelectronic ions.

   

• All isoelectronic ions belong to the same period of the periodic table.
• The wrong statements or F^{-} and Na^{+} are the isoelectronic but they are the different periods.
• Van der wall's radius of iodine is more than its covalent radius.
• I.E.I of O is the higher than that the N while I.E.2 of O higher than that N because of stable half filled configuration.
• The enthalpy of N to gain the electrons is almost zero but P is 74.3 kJ mol-1 .