Elements are made of one kind of atom, Atoms are the smallest units of matter, Electrons move around the atom nucleus, Protons have a positive electric charge, Neutrons have no electric charge at all, Atomic number equals the number of protons, Isotopes are elements that have different numbers of neutrons, Mass number counts protons and neutrons, Nuclear reactions change the atom nucleus, Atoms of one element share atomic numbers

Review Physical Science Basic concepts about elements

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