The building blocks of matter. Made up of protons, electrons, and neutrons.

A pure substance - all the atoms have the same atomic number, or number of protons.A chemical substance that can not be broken down into any other substances.

The center of an atom, it contains the protons and neutrons.

Particles that have a (+) positive charge Found in the nucleus of an atom

Particles that do not have a charge and are neutral Found in the nucleus of the atom

Particles that have a (-) negative charge Found in the electron cloud outside of the nucleus

A molecule that has two or more different elements bonded together. Example: H and O chemically joined together H2O

Same as the number of protons Same as the number of electrons APE

Equal to the number of protons plus neutrons found in an atom MAN

All particles/atoms are the same EX: element compounds

Each substance keeps its own properties Do NOT chemically combine Can be separated

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