In covalent bonding, non-metal atoms join together and share electrons. Bonds are represented with a short line drawn between elements. What dictates whether we draw single bonds (one line) or double bonds (two lines)?
The number of shared electrons. If there is more than one pair of shared electrons you need to draw more than 1 line. For example, oxygen is in group 6. This means it has 6 electrons on its outer shell. 2 oxygen atoms will bond and share 2 pairs.
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