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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
The set that contains atomic number of only transition element is -
  • A
    $21,32,53,64$
  • ✓
    $21,25,42,72$
  • C
    $9,17,34,38$
  • D
    $37,42,50,64$
✓

Answer

Correct option: B.
$21,25,42,72$
b
Tranition elements $=21$ to $30$

$37$ to $48$

$57$ $\&$ $72$ to $80$

Ans. $21,25,42\, \& 72$

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