Question
No. of electron in penultimate shell of $d-$ block elements
✓
Answer
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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