Atmospheric oxygen is denoted by what symbol?
##O_2(g)##
Oxygen as a gas is made up of molecules that each are built from two atoms of the element oxygen, that is denoted by ##O##.
There is another form of oxygen, known as ozone ##O_3##, that has three oxygen atoms per molecule. Though highly poisonous, it is an essential part of the upper atmosphere (it stops dangerous UV rays).
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