The atomic number and mass number for calcium-39 are 20 and 39,respectively.How many neutrons are in one atom?
A)1
B)19
C)20
D)39
E)59

Name: The atomic number and mass number for calcium-39 are 20 and 39,respectively.How many neutrons are in one atom? A)1 B)19 C)20 D)39 E)59
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Question

Quizplus · Accepted Answer

The number of neutrons in an atom is calculated by subtracting the atomic number from the mass number. Therefore, the number of neutrons in calcium-39 = 39-20 = 19. Choice B is the only option that gives the correct answer of 19.

The Atomic Number and Mass Number for Calcium-39 Are 20