hydrogen bonds and covalent bonds?

How are hydrogen bonds different that covalent or ionic bonds

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  • 1 decade ago
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    A hydrogen bond occurs when Hydrogen is bonded to a very electronegative element, usually Fluorine, Nitrogen, or Oxygen. The difference in electronegativity is so great that the Hydrogen is basically a positive charge and it's attracted to the negative charge of another molecule of the compound.

    For example, if you have H2O, the O pulls the electrons away from the H's, so the H's are slightly attracted to the O's of other water molecules. So it'd be Like

    H-O-H-------------OH2(water)

    A covalent bond is when electrons are shared between two atoms. This usually happens between two nonmetals or two atoms with similar electronegativities. For example, CH4 has covalent bonds.

    An ionic bond is when the electronegativity difference is so great that one atom has its electrons pulled off and another atom takes them.

    An example would be NaCl, where the electrons are pulled off the Na and given to the Cl, which results in Na+ and Cl- which stick together because of their opposite charges.

    Ionic bonds are the strongest, followed by covalent, and hydrogen bonds being the weakest of the three.

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