Final answer:
Atoms of different elements must have different atomic numbers, and isotopes have the same atomic number but different mass numbers.
Explanation:
Atoms of two different elements must have different
- electrical charges.
- numbers of neutrons.
- atomic numbers.
- energy levels.
All atoms with a particular number of protons belong to the same element. Atoms of an element that contain different numbers of neutrons are called isotopes. Each isotope has the same atomic number but a different mass number, which is the sum of protons and neutrons.
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