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 c. 20 b. 39 d. 2

asked Jan 28, 2019 37.7k views

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1 vote

The answer will be option c

BenVida answered Jan 29, 2019

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i believe the answer is c) 20

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