If an atom has 9 protons and 4 neutrons, what is its mass number?

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Multiple Choice

If an atom has 9 protons and 4 neutrons, what is its mass number?

Explanation:
Mass number is the total number of nucleons in the nucleus, which is protons plus neutrons. Here, 9 protons plus 4 neutrons gives 9 + 4 = 13. So the mass number is 13. This is different from the number of protons (which would be 9) or the number of neutrons (which would be 4).

Mass number is the total number of nucleons in the nucleus, which is protons plus neutrons. Here, 9 protons plus 4 neutrons gives 9 + 4 = 13. So the mass number is 13. This is different from the number of protons (which would be 9) or the number of neutrons (which would be 4).

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