Result of sharing of electrons by two nonmetal atoms
BOTH atoms fill their octet (H exception)
Octet is satisfied when the two atoms are combined
http://quatr.us/chemistry/atoms/covalent.htm
http://chemwiki.ucdavis.edu/Core/Theoretical_Chemistry/Chemical_Bonding/General_Principles_of_Chemical_Bonding/Covalent_Bonds
Covalent Bonding Video
Very helpful links! It is also important to remember that covalent bonds only form between nonmetals.
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