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.