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Which of the following are true concerning mass?
Particles that are counted in the mass of an atom, are protons, neutrons, and
electrons.
Particles that are counted in the mass of an atom, are protons and electrons.
Mass is the number of particles inside of an object.
Particles that are counted in the mass of an atom, are protons, neutrons.
Particles that are counted by a balance, are atoms and molecules.

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Answer:

Particles that are counted in the mass of an atom, are protons, neutrons.