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An elements mass number is made up of the number of ____ in the nucleus. protons and neutrons electrons and neutrons protons and electrons atoms and molecules
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An elements mass number is made up of the number of ____ in the nucleus.

protons and neutrons

electrons and neutrons

protons and electrons

atoms and molecules

An elements mass number is made up of the number of ____ in the nucleus. protons and-example-1
User Serghei
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Answer:

The answer is protons and nuetrons

Step-by-step explanation:

User Theadriangreen
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