alleryFirst ionisation enthalpy generally decreases down a:
APeriod
BBlock
CPanel
DGroup
Answer & Solution
Correct answer: D. Group
1. Going down, the outer electron sits further from the nucleus.
2. It is therefore easier to remove.
3. So the enthalpy decreases down a group.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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