A. 0.5
B. 0.8
C. 1.2
D. 1.5
Correct Answer: Option C
C. 1.2
Explanation
The element B has a mass number of 70 with atomic number 32. Hence, B has 32 protons and (70-32) = 38 neutrons.
The neutron- proton ratio is 38:32 = 38/32 =1.1875
≊1.2
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