Final answer:
Matter is made up of atoms, the basic units of matter consisting of protons, neutrons, and electrons. Models such as the atomic theory explain the composition and properties of substances.
Explanation:
Matter is anything that has mass and occupies space. It is composed of atoms, which are the basic units of matter. Atoms are made up of protons, neutrons, and electrons.
Models of matter include the atomic theory, which states that all matter is made up of atoms and molecules. These models help us understand the behavior and properties of different substances.
Atoms are the smallest units of matter that retain the properties of an element. They consist of a nucleus containing protons and neutrons, with electrons orbiting around the nucleus.
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