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atoms1
atom definitions
Question | Answer |
---|---|
proton | a positive particle in the nucleus of the atom |
neutron | a neutral particle in the nucleus of the atom |
electron | a negative particle which moves in shells around the nucleus |
atomic number | the number of protons in an atom |
mass number | the sum of protons and neutrons in an atom |
isotopes | atoms of the same element with the same number of protons and electrons but different numbers of neutrons |