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In covalent bonding Non metals combine together by sharing electrons. The shared pair of electrons holds the two atoms together. It's called a covalent bond. The group of atoms bonded together in this way is called a molecule.

It occurs because of the tendency of the atom to have its valence shell full (#Octet# #r##u##l##e#)

This is one of an example of how an atom shares its electrons with the other element in such a way that the two elements have full
#8# electron in their valence shell.

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In the above example the #o##xy##g##en# atom needs #2# more electrons So,it shares the #2# electrons from a #o##xy##g##en# molecule to for a covalent bond molecule.