Question

Which metal in the first series of transition metals exhibits $+1$ oxidation state most frequently and why?

Answer 1

Copper metal (with electronic configuration $\left[Ar\right]3d^{10}4s^1$) in the first series of transition metals exhibits $+1$ oxidation state most frequently as it readily loses one electron (present in 4s orbital) to give stable $3d^{10}$ electronic configration.