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

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Solution

The correct option is B 26
Firstly , the atomic number of Ar is 18, 5 is then added to 18 due to presence of electrons in $d - o r b i t a l$ . Total number of electrons in $X^{+ 3}$ is 23.
Oxidation means loss of electrons , so, +3 charge implies 3 electrons loss by X to form $X^{+ 3}$ .
Hence , number of electrons in
X = 23 + 3 = 26.
We know that in a neutral element, number of electrons = number of protons = atomic number.
Therefore, atomic number of X = 26

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