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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
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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

User Dalwin
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The answer will be option c
User BenVida
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i believe the answer is c) 20

User Martin Petrov
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