Carbon Bonding

Because it has four valence electrons, carbon needs four more electrons to fill its outer energy level. ... By forming four covalent bonds, carbon shares four pairs of electrons, thus filling its outer energy level. A carbon atom can form bonds with other carbon atoms or with the atoms of other elements.

OR

It is the structure of the electron configurations that drive chemical reactions. The electrons will freely to move between atoms in order to achieve stability. The movement and rearrangement of electrons are what causes chemical reactions.

choose one or choose two haha.., it's up to you