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atoms have a fuller shell are stable. These atoms don't tend to gain or lose electrons to become stable.
a positively charged subatomic particle that is found in the nucleus of an atom. mass = 1 amu
a unique number for each element that equals the number of protons in an atom of that element
a negatively charged subatomic particle that is found in the space outside the nucleus of an atom. mass = 0 amu
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