MCQ
Identify the least stable ion amongst the following:
- ALi−
- BBe−
- CB−
- DC−
✓
Answer
- Be-
Explanation:
The configuration of Li is 1s22s1. Adding one e− will fill its 2s subshell providing it extra stability.
The configuration of Be is 1s22s2. Adding one e− will disturb its stable fully filled configuration. So, it is the least stable among all.
The configuration of B is 1s22s22p1. It does not have half-filled or fully filled configuration so adding one e− will not disturb its stable configuration.
The configuration of C is 1s22s22p2. It does not have half-filled or fully filled configuration so adding one e− its configuration becoes 1s22s22p3 that it is a half-filled configuration and becomes stable.
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