chemical bonds

... Chemical bonds Hydrogen Bond Co-ordinate Bond Covalent Bond Ionic Bond A hydrogen bond results from a dipole-dipole force between an electronegative atom and a hydrogen atom bonded to nitrogen, oxygen or fluorine (thus the name "hydrogen bond", which must not be confused with a covalent bond to hydrogen). The energy of a hydrogen bond (typically 5 to 30 kJ/mole) is comparable to that of weak covalent bonds (155 kJ/mol), and a typical covalent bond is only 20 times stronger than an intermolecular hydrogen bond. These bonds can occur between molecules (intermolecularly), or within different parts of a single molecule (intramolecularly). The hydrogen bond is somewhere between a covalent bond and an electrostatic intermolecular attraction. It's a special type covalent bond in which both the shared electrons are contributed by one and the same atom only and not by each atom as in case of normal covalent bond. A coordinate bond will be established between two atoms

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