How many unpaired electron would be found in the ground state of Vanadium?

Question

It is a chemistry question. I also want to know how to get that answer? Thank You

Answer 1

Look at the proton number, which is 23. That means the electron arrangement ends in 3d3 4s2. Hund's Rule suggests that the 3d3 electrons go in separate orbitals before being forced to pair up, so a V atom has 3 unpaired electrons.