atom - the smallest particle of an element that has the properties of that element, nucleus - the dense central core of an atom, proton - a particle with a positive electric charge, neutron - a particle that has no electric charge, electron - a particle with a negative electric charge, atomic-number - the number of protons in one atom of an element, metals - elements that are shiny and can be rolled or pounded into various shapes, nonmetals - elements that have no shine and cannot be shaped, semimetals - elements that have some properties of both metals and nonmetals, noble gases - gases that not do not react readily with other elements,

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