What is the electronic structure of selenium? What salt would it form with chromium metal?

And thus if we got $C r \left(V I +\right)$, we would have $C r S {e}_{3}$, just as we have $C r {O}_{3}$ or $C r {S}_{3}$...in that oxygen, sulfur, and selenium commonly form ${E}^{2 -}$ ions........
While $C r {O}_{3}$ is certainly known, $\text{chromic selenide}$ might be rare or unknown. The Cr(II) salt, CrSe, is certainly known........