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Sati [7]
4 years ago
7

An atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has ______ neutrons in its nucleus.

Biology
2 answers:
Eva8 [605]4 years ago
7 0
C ) 20
because if you subtract 19 from 39 it would be 20
Semenov [28]4 years ago
3 0
C. 20 because 39-19 is 20 so there are 20 neutrons and the atomic number is the same as number of protons and electrons.
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