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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
MCQ
Electronic configuration of a transition element $X$ in $+3$ oxidation state is $[Ar]3d^5$. What is its atomic number?
 
  • A
    $25$
  • ✓
    $26$
  • C
    $27$
     
  • D
    $24$
✓

Answer

Correct option: B.
$26$
Electronic configuration of element $X = [Ar] 3d^{5+}$ oxidation state $= 18 + 5 + 3 = 26.$

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