Final answer:
Atoms are the building blocks of elements, each defined by the number of protons, such as carbon and oxygen.
Explanation:
Atoms are the building blocks of matter, and each element consists of a unique type of atom. The number of protons in the nucleus determines the type of atom, which in turn defines the element. For example, an atom with six protons is a carbon atom, and with eight protons, it is an oxygen atom.
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