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STD 11 - 3. Classification of elements and periodicity in properties — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 3. Classification of elements and periodicity in properties4 Marks
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
$(\mathrm{n}-1) \mathrm{s}^{2} \mathrm{p}^{6} \mathrm{d}^{1-10} \mathrm{ns}^{0-2}$

(Penultimate) $=n-1$ shell

$\Rightarrow \quad 9 \quad-\quad 19$

      Lower $\quad$ Higher

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