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Question: Answered & Verified by Expert
Assertion : Generally, ionization enthalpy increases from left to right in a period.
Reason : When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus.
ChemistryClassification of Elements and Periodicity in Properties
Options:
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If the Assertion is incorrect but the Reason is correct.
Solution:
1353 Upvotes Verified Answer
The correct answer is:
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Ionization enthalpy depends upon two factors:
(a) the attraction of electrons towards the nucleus,
and
(b) the repulsion of electrons from each other.

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