- The carbon atom has 4 electrons in the valence shell. Carbon can share these 4 electrons with various elements, like hydrogen, oxygen, nitrogen, halogens, sulphur, phosphorus, etc.
- Carbon has the property of catenation. Two or more carbon atoms can share some of their valence electrons and form chains and rings of all sizes.
- The straight chains or branched chains or rings may have different shapes and sizes.
- Hence, carbon is capable of forming an unlimited number of compounds.