Carbon can share a maximum of four of its valence
electrons when bonding to other atoms. This is the reason why organic molecules
can be so large because of this bonding. Suppose you have a compound of CCl4.
You know that chlorine can only share 1 electron because 7 of its electrons are
filled. Also, in carbon, it can only share 4 electrons because 4 of it are
already filled. That is why carbon needs four chlorine to form CCl4.
