Question

a substance that is made up of just one kind of atom is called an _____________.

periodic table

element

proton

compound

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Explanation:

The question defines a substance composed of only one type of atom. A "Periodic Table" is a chart of elements, not a substance. A "Proton" is a subatomic particle, not a substance. A "Compound" consists of multiple types of atoms bonded together. An "Element" is the substance made of one kind of atom.

Answer:

Element