Questions: What determines the atomic number of an atom? A. The number of protons B. The mass C. The charge D. The number of neutrons

What determines the atomic number of an atom? A. The number of protons B. The mass C. The charge D. The number of neutrons
Transcript text: What determines the atomic number of an atom? A. The number of protons B. The mass C. The charge D. The number of neutrons
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Solution

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Solution Steps

Step 1: Understanding Atomic Number

The atomic number of an atom is a fundamental property that defines the identity of an element. It is represented by the symbol \( Z \).

Step 2: Identifying the Correct Determinant

The atomic number is determined by the number of protons in the nucleus of an atom. Each element has a unique number of protons, which distinguishes it from other elements.

Step 3: Evaluating the Options
  • A. The number of protons: This is correct, as the atomic number is defined by the number of protons.
  • B. The mass: This is incorrect, as atomic mass is determined by the total number of protons and neutrons.
  • C. The charge: This is incorrect, as charge is related to the balance of protons and electrons.
  • D. The number of neutrons: This is incorrect, as neutrons do not determine the atomic number.

Final Answer

The answer is \(\boxed{\text{A. The number of protons}}\).

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