Final answer:
The atomic number of oxygen is 8, which represents the number of protons in the nucleus of an oxygen atom on the periodic table.
Step-by-step explanation:
The atomic number of oxygen (O) is 8. The atomic number represents the number of protons in the nucleus of an atom. It determines the element's position on the periodic table and is unique to each element. In the case of oxygen, it has 8 protons, which gives it an atomic number of 8.
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