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What does the atomic number tell you about an atomwhat two particles add up to equal the mass number?

What does the atomic number tell you about an atomwhat two particles add up to equal the mass number?
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What does the atomic number tell you about an atomwhat two particles add up to equal the mass number?

User ThirstForKnowledge
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the atomic number is the number of the protons in an atom the two particles that add up to equal the mass is the protons and neutrons
User Mariela
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