Differentiate among ionic, covalent, and hydrogen bonds

Answer:

A covalent bond is formed when two atoms share a pair of valence electrons.

Ionic bond is the attraction of two atoms for valence electrons is sufficiently uneven that the more electronegative atom removes one electron from its companion entirely. When the positive end of one molecule (typically hydrogen) attracts the negative end of another (typically highly electronegative elements), a hydrogen bond is created.