What element has 3 valence electrons in the 4d sublevel?

The element with 3 valence electrons in the 4d sublevel is Yttrium (Y). It is located in group 3 of the Periodic Table and has an atomic number of 39. In its electron configuration, Yttrium has the outer configuration of [Kr] 4d¹ 5s², contributing three valence electrons from the 4d and 5s orbitals.