What is a bond called that has a slightly positive end and a slightly negative end?

A bond characterized by having a slightly positive end and a slightly negative end is known as a polar bond. This occurs when two atoms share electrons unequally due to differences in their electronegativities. The atom with higher electronegativity pulls the shared electrons closer to itself, creating a partial negative charge, while the less electronegative atom has a corresponding partial positive charge. This dipole moment is what defines a polar bond.

In contrast, a covalent bond usually involves the equal sharing of electrons, resulting in no significant charge separation. An ionic bond occurs when one atom completely transfers electrons to another, leading to the formation of charged ions rather than a polar nature. A hydrogen bond refers to an attractive force between a hydrogen atom (which is covalently bonded to a more electronegative atom) and another electronegative atom, but it is not classified as a bond that inherently possesses a permanent dipole.