STANDARDChemistry-d and f Block Elements
STANDARD Chemistry Electronic Configuration MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d⁵. What is its atomic number?
A
25
B
26
C
27
D
24
Correct Answer
Option B
Detailed Explanation
The electronic configuration of X³⁺ is [Ar]3d⁵. Atomic number of X = 18 (Ar) + 5 (3d electrons) + 3 (oxidation state) = 26.
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