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In order for a hydrogen bond to form, it must be covalently bonded to Fluorine, Oxygen, or Nitrogen and it must be with a Fluorine, Oxygen, or Nitrogen atom with a lone pair. For example, the hydrogens in H2O interact with the Oxygen in water molecules (which has 2 lone pairs). Also, since Hydrogen only has an s orbital, it can only be on the outside of a molecule (it can only make one bond so it cannot be a central atom).
As stated by others, hydrogen bonding can only occur with N, O, and F. The hydrogen that is going to bond must bond to one of those three atoms AND must already be bonded to either N, O, or F. Also, hydrogen will never be the central atom so you don't have to worry about that coming up:)
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