Multiple choice

Atoms of an element contain only one type of atom because they each contain the same number of:

  1. protons

  2. neutrons

  3. electrons

  4. nucleons
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A Correct answer
Explanation

The identity of an element is uniquely determined by its atomic number, which is the number of protons in the nucleus of its atoms. While atoms of the same element can have different numbers of neutrons (isotopes) or electrons (ions), they must always have the exact same number of protons.

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