Molecules containing double bonds [Higher tier only]
Some molecules contain a double or triple bond. This type of bond occurs when more than one pair of electrons are shared between the atoms to attain a full outer shell (double bond 鈥 2 pairs of electrons, triple bond 鈥 3 pairs of electrons).
An example is carbon dioxide.
Image caption, 1. One carbon atom with four cross electrons, and two oxygen atoms with six dot electrons
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This can be represented as 0=C=0.