Selenium (Se) is a nonmetal with a relatively high electronegativity. This means that it tends to attract electrons towards itself in a covalent bond. Therefore, in compounds where selenium is bonded to more electronegative atoms, it will have a more positive partial charge.

Here are some examples:

* Selenium oxides (SeO₂ and SeO₃): Oxygen is more electronegative than selenium, so the selenium atom will carry a partial positive charge.

* Selenium halides (SeF₄, SeCl₄, SeBr₄): Fluorine, chlorine, and bromine are all more electronegative than selenium, leading to a positive partial charge on the selenium atom.

* Selenium hydrides (H₂Se): Even though hydrogen is less electronegative than most nonmetals, it's still slightly more electronegative than selenium, resulting in a small positive partial charge on selenium.

In general, the greater the difference in electronegativity between selenium and the other atom in the bond, the more positive the partial charge on the selenium atom.

It's important to note that the magnitude of the partial charge can vary significantly depending on the specific compound and the nature of the bond.