An atom's mass number is 13 and its atomic number is 6.How many neutrons are in its nucleus?
A)19
B)7
C)13
D)6

Name: An atom's mass number is 13 and its atomic number is 6.How many neutrons are in its nucleus? A)19 B)7 C)13 D)6
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Question

Quizplus · Accepted Answer

The number of neutrons can be calculated by subtracting the atomic number (which is the number of protons) from the mass number. 
Neutrons = mass number - atomic number
= 13 - 6
= 7. 
Therefore, there are 7 neutrons in the nucleus.

An Atom's Mass Number Is 13 and Its Atomic Number