Question

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

Answer 1

Well selenium is a chalcogen; it shares the same group, and same electronic structure as oxygen or sulfur.

Explanation:

And thus if we got `Cr(VI+)`, we would have `CrSe_3`, just as we have `CrO_3` or `CrS_3`...in that oxygen, sulfur, and selenium commonly form `E^(2-)` ions........

While `CrO_3` is certainly known, `"chromic selenide"` might be rare or unknown. The Cr(II) salt, CrSe, is certainly known........