The mass number of an atom is calculated by adding the number of protons and neutrons together.
In this case, the atom has:
- 12 protons
- 13 neutrons
So, the mass number = 12 (protons) + 13 (neutrons) = 25.
The correct answer is 25.
What is the mass number of an atom that has 12 protons, 13 neutrons, and 13 electrons?
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13
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25
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12
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26
1 answer
1 answer