Question

If an atom has 5 protons, 7 neutrons and 5 electrons what is the mass number of the atom?

Answer 1

Answer:

7+5=12

Step-by-step explanation:

To calculate the mass number of an atom, you have to add the protons and the neutrons. We have 7 neutrons and 5 protons, so your mass number would be 12. Let me know if you have any further questions. :)