MCQ
The number of s-electrons present in an ion with $55$ protons in its unipositive state is
- A$8$
- B$9$
- C$12$
- ✓$10$
✓
Answer
Correct option: D.
$10$
d
$Z =55[ Cs ] \Rightarrow[ Xe ] 6 s ^1$
$Z =55[ Cs ] \Rightarrow[ Xe ] 6 s ^1$
$\left[ Cs ^{+}\right] \Rightarrow[ Xe ]$ i.e. upto $5 s$ count $e ^{-}$of s-subshell i.e. $1 s , 2 s , 3 s , 4 s , 5 s \Rightarrow 10$ electrons
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