If an atom has 2 protons and 2 neutrons, its mass number is

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Multiple Choice

If an atom has 2 protons and 2 neutrons, its mass number is

Explanation:
Mass number counts all the nucleons in the nucleus, which are protons and neutrons. With 2 protons and 2 neutrons, there are 2 + 2 = 4 nucleons total, so the mass number is 4. (Electrons don’t affect the mass number; the number of protons, which is 2, would be the atomic number.)

Mass number counts all the nucleons in the nucleus, which are protons and neutrons. With 2 protons and 2 neutrons, there are 2 + 2 = 4 nucleons total, so the mass number is 4. (Electrons don’t affect the mass number; the number of protons, which is 2, would be the atomic number.)

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