alleryThe first ionisation enthalpy of boron against beryllium is:
ASlightly less
BSlightly more
CExactly same
DTwice as much
Answer & Solution
Correct answer: A. Slightly less
1. Boron has the greater nuclear charge of the two.
2. Even so, its value breaks the expected pattern.
3. It is slightly less than that of beryllium.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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