Question

What is the mass number of an atom that has 6 protons, 7 neutrons, and 6 electrons?
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Seven
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Six
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12
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13

Answer 1

The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. In this case, the atom has:

- Protons: 6
- Neutrons: 7

So, the mass number is:

6 (protons) + 7 (neutrons) = 13

Therefore, the mass number of the atom is **13**.