ion - charged particle caused by losing or gaining electrons , element - substance made of only one type of atom, compound - 2 or more elements chemically bonded together , atomic number - number of protons in the nucleus of an atom , mass number - number of protons and neutrons in the nucleus of an atom , relative atomic mass  - The average mass of an atom of an element compared to 1/12th the mass of an atom of carbon twelve , proton - positive , neutron - neutral , electrons - negative ,

Atomic Structure Definitions

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