protons - a subatomic particle with a positive charge that is located in the nucleus of an atom, neutrons - a subatomic particle with no electric charge, located within the nucleus of the atom, electrons - a subatomic particle with a negative charge, electron shells - the path or orbit electrons follow around the nucleus of an atom, atoms - the smallest unit of an element that has the properties of that element, nucleus - the center of an atom containing protons and neutrons, atomic mass - the combined mass of all of the protons and neutrons of an atom., atomic number - the number of protons in the nucleus of an atom, molecule - two or more atoms joined together, element - a pure substance that cannot be broken down into simpler substances by chemical reactions,

The Atom Vocabulary

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