Figure \PageIndex4: (A) The structural model for C2H4 consists of a double covalent bond between the two carbon atoms and single bonds to the hydrogen atoms. (B) Molecular model of \(...Figure \PageIndex4: (A) The structural model for C2H4 consists of a double covalent bond between the two carbon atoms and single bonds to the hydrogen atoms. (B) Molecular model of C2H4. (Public Domain; Ben Mills (Wikimedia: Benjah-bmm27) via (A) http://commons.wikimedia.org/wiki/File:Ethylene-CRC-MW-dimensions-2D-Vector.svg; (B) http://commons.wikimedia.org/wiki/File:Ethylene-CRC-MW-3D-balls.png)