Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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What is the mass number of an atom with 60 protons, 60 electrons, and 75 neutrons?

  1. 120

  2. 135

  3. 60

  4. 75

The correct answer is: 135

The mass number of an atom is determined by the total number of protons and neutrons present in its nucleus. In this case, the atom in question has 60 protons and 75 neutrons. To find the mass number, you simply add these two quantities together: Mass number = Number of protons + Number of neutrons Mass number = 60 protons + 75 neutrons = 135 Therefore, the mass number is 135, making it the correct choice. Understanding this concept is crucial because the mass number provides important information about the element's identity and its isotopes. Protons define the element itself, while neutrons contribute to the overall atomic mass and stability of the nucleus.

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