MCQ
An ion which has $18$ electrons in the outermost shell is
- A${K^ + }$
- B$C{s^{ + }}$
- C$T{h^ 4+ }$
- ✓$C{u^ + }$
✓
Answer
Correct option: D.
$C{u^ + }$
d
The electronic configuration of $Cu , Th , Cs$ and $K$ are
The electronic configuration of $Cu , Th , Cs$ and $K$ are
$Cu (29)=2,8,18,1$
$C u^{+}=2,8,18$
$\operatorname{Th}(90)=2,8,18,32,18,10,2$
$T h^{4+}=2,8,18,32,18,8$
$\operatorname{Cs}(55)=2,8,18,18,8,1$
$C s^{+}=2,8,18,18,8$
$K (19)=2,8,8,1$
$K^{+}=2,8,8$
Thus, $C u^{+}$has $18$ electrons in the outermost shell.
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