MCQ
Ionization energy is highest in $ .........$
- A$\ce{[Ne]3s^1}$
- ✓$\ce{[Ne]3s^23p^3}$
- C$\ce{[Ne]3d^{10}4s^24p^3}$
- D$\ce{[Ne]3s^23p^4}$
✓
Answer
Correct option: B.
$\ce{[Ne]3s^23p^3}$
$\ce{[Ne]3s^23p^3}$ has the highest ionisation energy because along the period ionisation energy increases $($as effective nuclear charge increases$).$
It has a half $-$ filled $3p$ sublevel which is more stable than a partially filled sublevel in $\ce{[Ne]3s^23p^4}$, sulphur. This is why phosphorus has higher first ionization energy than sulphur.
It has a half $-$ filled $3p$ sublevel which is more stable than a partially filled sublevel in $\ce{[Ne]3s^23p^4}$, sulphur. This is why phosphorus has higher first ionization energy than sulphur.
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