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5 October, 11:01

How many neutrons make up one of these potassium atoms?

19

20

38

58

+2
Answers (2)
  1. 5 October, 11:06
    0
    B 20

    (i took the test)
  2. 5 October, 11:10
    0
    To find the number of neutrons you take the atomic mass, 39, and subtract the number of protons, 19.

    so 39-19=20

    potassium has 20 neutrons
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