Oxygen Lewis Structure. So the double bond the two parallel lines represents a total of 4 electrons. Each bond is a pair of electrons one from each connected o atom.
Where six are arranged around each oxygen atom in a way that one side has four valence electrons. The two bonds appear as the two parallel lines between the o atoms. This is the structure of formaldehyde which is used in embalming fluid.
The lewis dot structure for o2 or dioxygen is as follows.
Both the oxygen and the carbon now have an octet of electrons so this is an acceptable lewis electron structure. Besides this the lewis structure helps with determining the hybridization of the molecule. The two oxygen atom can both achieve a stable structure by sharing two pairs of electrons. The lewis structure helps with understanding how electrons are distributed within a compound along with its molecular geometry.