1, 2, 3, 4, 6, 12
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84 is the mass number: 36 proton plus 48 neutrons
84 is the mass number: 36 proton plus 48 neutrons
84 is the mass number of a stable isotope of krypton, 84Kr has 36 protons and 48 neutrons in its nucleus that give it an atomic weight of 84.
The number that goes into both 84 and 105 evenly is 21.
The highest common factor of 60 and 84 is 12