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. :)
I’m sorry this is messy but I hope this is right!! <3
Answer:
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Step-by-step explanation:ujjj