Atomic number is defined as the

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Multiple Choice

Atomic number is defined as the

Explanation:
The atomic number tells you how many protons are in the nucleus. This count defines the element’s identity and its place on the periodic table. In a neutral atom, the number of electrons equals the number of protons, so the atomic number also matches the number of electrons. The other ideas describe different properties: the total number of nucleons is the mass number (protons plus neutrons), mass divided by charge isn’t a recognized descriptor for atomic number, and the number of electrons can vary in ions, so it isn’t the atomic number.

The atomic number tells you how many protons are in the nucleus. This count defines the element’s identity and its place on the periodic table. In a neutral atom, the number of electrons equals the number of protons, so the atomic number also matches the number of electrons. The other ideas describe different properties: the total number of nucleons is the mass number (protons plus neutrons), mass divided by charge isn’t a recognized descriptor for atomic number, and the number of electrons can vary in ions, so it isn’t the atomic number.

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