Atom, Smallest unit of matter that retains the properties of an element., Proton, Positively charged subatomic particle., Neutron, A neutral subatomic particle., Electron, Negatively charged subatomic particle., Nucleus, Protons + Neutrons. The center of an atom., Compound, Made up of 2 or more different types of atoms., Molecule, 2 or more atoms that are bonded together., Element, They are made up of one type of atom., Mixture, A combination of 2 or more substances that are not chemically combined. The parts can be separated., Atomic Number, Equals the number of protons, Atomic Mass, Equals the total number of neutrons and protons, Pure Substance, Contains only one type of matter, Charge, Determined by comparing the number of protons to the number of electrons., Where are electrons located?, Outside the nucleus

Atomic Structure

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