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25 September, 04:44

How many neutrons are in the radioactive isotope?

40

19

21

20

+2
Answers (1)
  1. 25 September, 04:53
    0
    The sum of the number of neutrons and protons in an atom's nucleaus defines its approximate atomic weight. For example, all carbon atoms have six protons; isotopes of carbon can have 6, 7, or 8 neutrons (Table 1).
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