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10 September, 15:10

8. If an atom contains 12 protons and 10 neutrons, what's its mass number?

A. 2

B. 10

C. 12

D. 22

What it's mass number?

+3
Answers (1)
  1. 10 September, 15:21
    0
    I would be D. 22 since you would add the neutrons and protons together in prefer to he the mass number.
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