The primordial atmosphere of Earth became unbalanced due to the increased generation of oxygen. Considering that many anaerobic creatures found oxygen to be harmful.
Anything with just one kind of atom in it. An oxygen atom has eight protons in its nucleus, as indicated by its atomic number of 8, which is represented by the letter O in its official chemical formula. At room temperature, oxygen is a gas that lacks all other flavors, smells, and colors.
All of the molecules involved are visible in chemical equations because of how they are built. The symbol for oxygen is an a because each molecule has two oxygen atoms. The oxygen molecules that make up our breath are diatomic, or composed of just two oxygen atoms.
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