3 years ago

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]3 years ago

7 0

C ) 20
because if you subtract 19 from 39 it would be 20

Semenov [28]3 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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