The atomic number indicates the atom's identity and equals the number of what?

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Study for the Georgia High School Physical Science Test. Prepare with flashcards and multiple-choice questions, detailed hints and explanations included. Get ready for your exam!

Multiple Choice

The atomic number indicates the atom's identity and equals the number of what?

Explanation:
The key idea is that the atomic number is the number of protons in the nucleus, and that count uniquely identifies the element on the periodic table. Protons define the element’s identity, so changing this number would create a different element. Neutrons can vary between isotopes of the same element, affecting mass but not the element’s identity. Electrons can vary in charged states, but the atomic number remains tied to protons. Therefore, the atomic number equals the number of protons.

The key idea is that the atomic number is the number of protons in the nucleus, and that count uniquely identifies the element on the periodic table. Protons define the element’s identity, so changing this number would create a different element. Neutrons can vary between isotopes of the same element, affecting mass but not the element’s identity. Electrons can vary in charged states, but the atomic number remains tied to protons. Therefore, the atomic number equals the number of protons.

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