Which statement defines the atomic number of an element?

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Study for the DAT Bootcamp General Chemistry Test. Enhance your skills with detailed questions and explanations. Master exam topics such as atomic structure, chemical reactions, and periodic trends. Prepare confidently for your exam!

Multiple Choice

Which statement defines the atomic number of an element?

Explanation:
The atomic number is defined by the number of protons in the nucleus. This count uniquely identifies the element and is what sits as Z on the periodic table. Mass number equals protons plus neutrons, so it tells you the total nucleons, not the identity. The number of electrons in a neutral atom equals the number of protons, but that only holds when the atom is neutral; the atomic number itself is defined regardless of charge. So the statement that it is the number of protons best defines the atomic number.

The atomic number is defined by the number of protons in the nucleus. This count uniquely identifies the element and is what sits as Z on the periodic table. Mass number equals protons plus neutrons, so it tells you the total nucleons, not the identity. The number of electrons in a neutral atom equals the number of protons, but that only holds when the atom is neutral; the atomic number itself is defined regardless of charge. So the statement that it is the number of protons best defines the atomic number.

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