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9 March, 14:12

8. What is the mass number of an atom that has 12 neutrons and 11 protons?

A 11

B 24

C 23

D 12

+5
Answers (2)
  1. 9 March, 15:09
    0
    C. 23

    Explanation:

    The mass is made up by the proton and nuetrons,

    12+11=23 your atomic mass
  2. 9 March, 15:25
    0
    C 23 is the mass number
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