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Thus, chemically there is only one kind of atoms in a pure element, but there can be several physically different kinds of nuclei in a pure element.
There are 90 naturally occurring types of atoms, or elements. Sugar has three different types of atoms: carbon, hydrogen, and oxygen.
There are 6 atoms of hydrogen in the compound H2H4O2. A compound is a substance made up of two or more different types of atoms that are chemically bonded together.