Covalent bond, Chemical bonding; animation

A covalent bond is a bond where two or more atoms share electrons. The sharing of atoms helps complete the outer shell, or valence shell, of both atoms. For example, oxygen has six valence electrons. It can form a covalent bond with two hydrogen atoms, each of which has one valence electron.
Covalent bonding takes place between two non-metals by the sharing of electrons.
The identification of covalent bond can be done by electronegative difference. The electronegative the molecules will be in between. 0 - 0 . 3 , then the bonding will be non-polar covalent bonding.
One, two, or three pairs of electrons may be shared between two atoms, making single, double, and triple bonds, respectively. The more covalent bonds between two atoms, the stronger their connection. Thus, triple bonds are the strongest.

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En difference should be less than 1.7