NCERT Class XI Chemistry
Which one of the following statements is incorrect in relation to ionization enthalpy? (a) Ionization enthalpy increases for each successive electron. (b) The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration. (c) End of valence electrons is marked by a big jump in ionization enthalpy. (d) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.
Solution in Detail
(video solution below this)
(a) is true. Reason: when a new electron is added, we move to the right in a period, and the IE tends to increase as we move from left to right in a period.
(b) is true. Reason: A noble gas configuration is the most stable. So we need the maximum amount of energy to remove an electron from a noble gas. [see video below for more clarification]
(c) is true. Reason: Noble gas configuration is obtained when valence electrons are removed. But noble gas configuration is the most stable, so the n-th IE will increase significantly.
(d) is false. Reason: It is easier to remove an electron from an orbital with greater n value because of shielding and screening of the valence electrons by the inner core electrons.
Please watch this youtube video for a quick explanation of the solution:
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