Electronic configuration of a transition element X in + 3 oxidation state is `[Ar]3d^5` What is its atomic number?

Options

A. 25
B. 26
C. 27
D. 24

Answer

B

Explanation

Electronic configuration of `X^(3+)` [Ar] `3d^(5)` = 23 electrons. Since `X^(3+)` is formed by the loss of three electrons, number of electrons in X is = 23 + 3 = 26. Therefore, the atomic number of the element is 26