What does the atomic number tell you about an atom?

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Multiple Choice

What does the atomic number tell you about an atom?

Explanation:
The atomic number tells you how many protons are in the atom’s nucleus. That count defines the element itself—changing the number of protons changes the element. Neutrons add to the mass but don’t affect the element’s identity, so the total of protons plus neutrons is the mass number. The mass of the nucleus isn’t determined by the atomic number. The number of electrons can vary if the atom is charged, so the atomic number doesn’t directly tell you the electron count in all cases. So, the key point is that the atomic number equals the number of protons.

The atomic number tells you how many protons are in the atom’s nucleus. That count defines the element itself—changing the number of protons changes the element. Neutrons add to the mass but don’t affect the element’s identity, so the total of protons plus neutrons is the mass number. The mass of the nucleus isn’t determined by the atomic number. The number of electrons can vary if the atom is charged, so the atomic number doesn’t directly tell you the electron count in all cases. So, the key point is that the atomic number equals the number of protons.

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