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.A covalent bond forms when two atoms overlap their outer energy levels in order to share pairs of valence electrons. The shared electrons are attracted to the nuclei of both atoms. Atoms that are covalently bonded together form a covalent compound, which can also be called a molecule.
.An ionic bond is the attraction of a positively charged ion to a negatively charged ion. Atoms can gain or lose electrons to become charged ions. Positive ions and negative ions are attracted to each other because of their opposite charges. Because of this opposite attraction, ionic bonds are very strong. Atoms that are ionically bonded together form an ionic compound.
.Table salt is an ionic compound
.The charged ends of one water molecule are attracted to the oppositely charged regions of its neighboring water molecules. This attraction between water molecules forms a hydrogen bonding.
.The covalent bonds in water involve an uneven sharing of electrons. The oxygen atom's nucleus attracts the shared electrons more strongly than the hydrogen nuclei. This difference in attraction causes the electrons to spend more time near the oxygen atom than they do near the hydrogen atoms. Because electrons are negatively charged particles, this uneven sharing of electrons gives the oxygen portion of the molecule a partial negative charge and the hydrogen portion a partial positive charge. The water molecule has no overall charge but has a positive end and a negative end.
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