| These are the pieces used to assemble the molecular models of ethene. On the left are 4 hydrogens, two trigonal carbon atoms, two pieces of black tubing for creating the double bond,
and the fastener used to create a single bond. On the right are 4 hydrogen atoms, 2 trigonal carbon atoms, two pieces of white tubing for the double bond, one short green tube for the double bond, and 4 longer green tubes
used to create single bonds.
| 
| In forming the double bond in the left image the fastener is used to first link the two carbon atoms together and then the tubing
is used to complete the double bond by sliding the tubing over the perpendicular posts of each carbon atom. The double bond in the image on the right
is created in a similar manner by first using the short green tube to link the two carbon atoms and then the tubing to complete the double bond.
| 
| In the completed molecule it is evident that there is no rotation for the carbon-carbon double bond. The molecular shape around each carbon atom
is trigonal planar and the electron pair geometry around each carbon atom is trigonal planar.
| 
| The four arrows shown in each image indicate how the Octet rule is fulfilled for one carbon atom. Note that there
are a total of 4 electrons shared between the two carbon atoms.
| 
| Structural formula of ethene. Remember that each dash represents one pair of electrons (two electrons).
| |
| Animated molecular model of ethene.
| | | | |
