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

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The atomic number is defined as?

  1. The number of neutrons in the atom

  2. The number of protons in the atom

  3. The total number of particles in the nucleus

  4. The number of electrons in the atom

The correct answer is: The number of protons in the atom

The atomic number is defined as the number of protons in the nucleus of an atom. This fundamental property of an element determines its identity and position on the periodic table. Each element has a unique atomic number, which differentiates it from other elements. For instance, hydrogen has an atomic number of 1, indicating it has one proton, while carbon has an atomic number of 6, meaning it has six protons. This concept is crucial in understanding atomic structure and chemistry, as the number of protons directly influences the chemical behavior of the element. Additionally, in a neutral atom, the number of protons is equal to the number of electrons, ensuring electrical neutrality. This foundational knowledge is essential for grasping more complex topics in chemistry and physics.

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