CH3CI is chloromethane. It is made up of one carbon atom, three hydrogen atoms and one chlorine atom. Carbon atom has 4 outermost electrons, each hydrogen atom has 1 electron and chlorine has 7 outermost electrons. Carbon shares its four outermost electrons with three hydrogen atoms and one chlorine atom to form CH3CI as follows

Each atom in CH3Cl has a noble gas electron arrangement. Carbon attains the nearest noble gas configuration of neon, hydrogen acquires the configuration of helium while chlorine achieves the configuration of argon. Chloromethane contains three C-H and one C-Cl covalent bonds.