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Question
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?
Options
25
26
27
24
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Solution
26
Explanation:
[Ar]3d5 : As X3+ is formed by the loss of 3 electrons, the configuration of element X is [Ar] 3d6 4s2.
∴ Atomic number = 26.
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