MCQ
No. of electron in penultimate shell of $d-$ block elements
- ✓$9-18$
- B$19-32$
- C$1-10$
- D$9-32$
✓
Answer
Correct option: A.
$9-18$
a
$(\mathrm{n}-1) \mathrm{s}^{2} \mathrm{p}^{6} \mathrm{d}^{1-10} \mathrm{ns}^{0-2}$
$(\mathrm{n}-1) \mathrm{s}^{2} \mathrm{p}^{6} \mathrm{d}^{1-10} \mathrm{ns}^{0-2}$
(Penultimate) $=n-1$ shell
$\Rightarrow \quad 9 \quad-\quad 19$
Lower $\quad$ Higher
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