What does the Atomic Mass Number represent?

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Prepare for the ACS Organic Chemistry Test with multiple choice questions and comprehensive explanations. Utilize flashcards for quick learning and gain confidence for your exam day!

Multiple Choice

What does the Atomic Mass Number represent?

Explanation:
The mass number is the total count of nucleons in the nucleus, which means protons plus neutrons. It equals Z + N, where Z is the number of protons (defining the element) and N is the number of neutrons. Electrons don’t contribute to this count because their mass is negligible and they sit outside the nucleus. Different isotopes have the same number of protons but different numbers of neutrons, giving different mass numbers. So the mass number represents protons plus neutrons.

The mass number is the total count of nucleons in the nucleus, which means protons plus neutrons. It equals Z + N, where Z is the number of protons (defining the element) and N is the number of neutrons. Electrons don’t contribute to this count because their mass is negligible and they sit outside the nucleus. Different isotopes have the same number of protons but different numbers of neutrons, giving different mass numbers. So the mass number represents protons plus neutrons.

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