![]() In the case of ethene, there is a difference from methane because each carbon is only joining to three other atoms rather than four. The carbon atom is now in an excited state. This is exactly the same as happens whenever carbon forms bonds - whatever else it ends up joined to. The carbon atom doesn't have enough unpaired electrons to form the required number of bonds, so it needs to promote one of the 2s 2 pair into the empty 2p z orbital. Unless you have some understanding of the true nature of the double bond, you can't really understand the way that ethene behaves.Įthene is built from hydrogen atoms (1s 1) and carbon atoms (1s 22s 22p x 12p y 1). It is important to explore the bonding in ethene in more detail because it has a direct impact on its chemistry. Each line represents one pair of shared electrons.Įthene has a double bond between the two carbon atoms.Ī more sophisticated view of the bonding in ethene The double bond is shown conventionally by two lines joining the atoms. Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Some simple molecules containing double bonds If you have come straight to this page via a search engine follow this link before you go on.Ī double covalent bond is where two pairs of electrons are shared between the atoms rather than just one pair. Warning! This page assumes that you have already read the page on single covalent bonds. It starts with a simple picture of double covalent bonding, and then takes a more sophisticated view of the bonding in ethene. This page explains how double covalent bonds arise. ![]()
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