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Question

The electronic configuration of a transition element X in its +3 oxidation state is [Ar]3d5. What is its atomic number?

A
25
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B
26
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C
27
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D
24
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Solution

The correct option is B 26
X3+=[Ar]3d5=23 electrons. As X3+ is formed by the loss of 3 electrons from X, X will have 26 electrons.
Atomic number of X=26.

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