According to the material, the Atomic Mass equals which quantity?

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Multiple Choice

According to the material, the Atomic Mass equals which quantity?

Explanation:
Atomic mass reflects the total mass of the nucleus, which comes from protons and neutrons together. This quantity is often called the mass number for a given isotope and is simply the sum of protons and neutrons (A = Z + N). The number of protons, by contrast, is the atomic number and identifies the element, not its mass. Electrons are present but contribute negligibly to the atomic mass, since their mass is tiny compared with the nucleons. So the mass of an atom is determined by the combined count of protons and neutrons, not just protons alone, and not electrons.

Atomic mass reflects the total mass of the nucleus, which comes from protons and neutrons together. This quantity is often called the mass number for a given isotope and is simply the sum of protons and neutrons (A = Z + N). The number of protons, by contrast, is the atomic number and identifies the element, not its mass. Electrons are present but contribute negligibly to the atomic mass, since their mass is tiny compared with the nucleons. So the mass of an atom is determined by the combined count of protons and neutrons, not just protons alone, and not electrons.

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