Question

A transition metal $X$ has a configuration [Ar] $3d^4$ in its $+3$ oxidation state. Its atomic number is

• A. 25
• B. 26
• C. 22
• D. 19

Answer 1

Answer: (A)

In $+3$ oxidation state $[Ar]3d^4$ In ground state $[Ar]3d^{5}4s^2$ Total protons or electrons $=18+2+5=25$