Asked by mathidislikeperson
An atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has ______ neutrons in its nucleus.
a. 19
b. 39
c. 20
d. 2
a. 19
b. 39
c. 20
d. 2
Answers
Answered by
Steve
39-19 = 20
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