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Anyone know what hydrogen bonding is?
It is an electrostatic bond between hydrogen and other non-metal with the high electronegativity. It is the strongest in HF (because F is the most electronegative element). It is also strong in H2O, NH3, HCl.
It is a special type of INTER-MOLECULAR bonding
It's also what hold the nucleotides of the sense strands and non-sense strands of a DNA double helix.
WebElements: the periodic table on the WWW [http://www.webelements.com/]