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can two atoms of the same element have different atomic numbers, why or why not

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Answer:

Question: can two atoms of the same element have different atomic numbers, why or why not

Answer:

Atoms of the same element always have the same number of protons, same Z, but often have different numbers of neutrons, therefore, different mass numbers. These atoms are called isotopes and are introduced in next section. An isotope of uranium has an atomic number of 92 and a mass number of 235.

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