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A. Neutrons and electrons B. Protons and electrons C. Electrons in energy levels D. Protons and neutrons
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A. Neutrons and electrons

B. Protons and electrons
C. Electrons in energy levels
D. Protons and neutrons

A. Neutrons and electrons B. Protons and electrons C. Electrons in energy levels D-example-1
User Alinwndrld
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3 votes

Answer:

D.

Step-by-step explanation:

Because protons and neutrons make up the mass of an atom.

User Lilliam
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