negatively charged particles in an atom
positively charged particles in an atom
neutrally charged particle in an atom
region surrounding the nucleus that contains the electrons
the number of protons in the nucleus of each atom of that element
atoms of the same element that have different numbers of neutrons
the sum of the numbers of protons and neutrons in the nucleus of an atom
weighted average mass of all the isotopes of an element,
the positively charged dense center of an atom
an atom that has a negative or positive charge because it has gained or lost one or more electrons
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