Question

The electronic configuration of transition element 'X' in +3 oxidation state is [Ar] 3d⁴. What is its atomic number?

Options

• 25

• 26

• 27

• 24

Answer 1

25

Explanation:

Electronic configuration of X³⁺: [Ar] 3d⁴

Electronic configuration of X: [Ar] 3d⁵ 4s²

Atomic number of X = 18 + 5 + 2 = 25