This picture shows an artistic view of the atomic structure of an oxygen atom. An atom is mainly composed of a positively charged nucleus (center) and some negatively charged electrons circling the nucleus. The nucleus is basically made up of neutrons and protons. The number of the protons in the nucleus equals that of the electrons circling outside. The chemical properties of an atom is decided by its proton number as well. As to the oxygen atom in this picture, there are 8 electrons orbiting around the nucleus consisting of 8 protons and 8 neutrons.

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