The mass number of a chromium atom is 52 and it has 24 protons. How many neutrons does this atom have?
Answer
A
28
B
76
C
24
D
80
Explanation
Mass number equals the number of protons plus the number of neutrons. Subtract the 24 protons from the mass number of 52: 52 − 24 = 28 neutrons. So the correct choice is 28.
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