MCQ
The highest first ionisation energy among the following elements.
- A$\ce{Cs}$
- ✓$\ce{Cl}$
- C$\ce{I}$
- D$\ce{Li}$
✓
Answer
Correct option: B.
$\ce{Cl}$
The first ionisation energy of nonmetals is very high and as we move down the group, it decreases so $\ce{Cl}$ have highest first ionisation energy among all.
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