atom - The smallest particle of an element., nucleus - Dense, positively charged mass at the center of an atom., proton - Positively charged subatomic particle found in the nucleus., neutron - Neutral subatomic particle found in the nucleus., mass number - The sum of the protons and neutrons in the nucleus of an atom., atomic number - Equal to the number of protons found in the nucleus., ion - A charged particle, isotopes - Versions of the same element with different numbers of neutrons.,

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