Neutron, Subatomic particles that do not have a charge and are neutral, Valence Electrons, Electrons in the outermost shell, determines reactivity, Electrons, Subatomic particles that have a negative charge, Atomic mass, The mass of an atom, Atomic Number, The number of protons and electrons found in an element, Nucleus, The center of an an atom, it contains the protons and neutrons, Electron Cloud, Energy levels where the electrons are found, Element, A pure substance- all atoms have the same atomic number or number of protons, Atoms, The building blocks of matter. Made up of protons, electrons, and neutrons, Strong Force, This holds the nucleus together, keeping the protons and neutrons together.

Atomic Structure

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