A. 15
B. 30
C. 35
D. 50
Correct Answer: Option C
C. 35
Explanation
Mass number = Protons = Neutrons = 15 + 20 = 35
A. 15
B. 30
C. 35
D. 50
Correct Answer: Option C
C. 35
Explanation
Mass number = Protons = Neutrons = 15 + 20 = 35
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