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shows the number and types of atoms in a molecule and how they are arranged
an unstable atom in which the nucleus decays (breaks down) releasing particles and energy
ending materials of a reaction; found on right side of chemical equation
interaction of substances that lead to the formation of new substances
identifies a specific element; equals the number of protons in an atom of each element
a pure substance that cannot be broken down into other substances by chemical reactions
electrons in the outermost energy level; they are involved in bond formation
occurs when atoms transfer electrons to other atoms
substance made of two or more elements, none of which is carbon
substance made of two or more elements, one being carbon