MCQ
Which among the following element has only one electron in valence shell?
- A$Ba$
- ✓$Rb$
- C$Ca$
- DRa
✓
Answer
Correct option: B.
$Rb$
(b): Rb is an alkali metal and it belongs to group 1. All the alkali metals have only one electron in their
valence shells. Valence shell electronic configuration of $Rb$ is $5 s^{\prime}$.
The other three elements i.e., $Ba , Ca$ and $Ra$ are group 2 elements which have two electrons in their valence shells.
valence shells. Valence shell electronic configuration of $Rb$ is $5 s^{\prime}$.
The other three elements i.e., $Ba , Ca$ and $Ra$ are group 2 elements which have two electrons in their valence shells.
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