C2H4 is the simplest alkene with the chemical name Ethylene or Ethene. It is also called Polyethylene or Etileno. It is commonly used as a plant hormone, as a refrigerant, and as a food additive. When we look at the molecules of C2H4 it has 2 CH molecules and 4 H molecules. The carbon atom consists of 6 electrons and hydrogen has 1 electron.