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Which two particles in an atom are equal in mass

User Dimon Buzz
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2 Answers

2 votes
Protons and Neutrons. 
User Luxerama
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6.8k points
3 votes
protons and neutrons.

Note: They probably are ABOUT the same mass. Don't think they are exactly the same.

Hope this helps!
User Rafaelcpalmeida
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