They tend to be linear, with the donor group pointing along the acceptor's lone pair orbital, though deviations often occur, particularly within the secondary structure of proteins.  
They normally have association energies between -12 and -40 kilojoules per mole.  The bifurcated type occurs when each donor interacts with two acceptors and vice versa.  They tend to be linear, with the donor group pointing along the acceptor's lone pair orbital, though deviations often occur, particularly within the secondary structure of proteins.  With approximately 10% covalent character, they are predominantly electrostatic interactions between electronegative atoms, such as fluorine, nitrogen, or oxygen, and their namesake.  FTP name these bonds that explain the unusual physical characteristics of water, named for the presence of the first element on the periodic table.
They normally have association energies between -12 and -40 kilojoules per mole.  
hydrogen bonds