Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 3 - No. 15)
Which of the following is an example of an isotope?
Two atoms with different numbers of protons.
Two atoms of the same element with different numbers of neutrons.
Two atoms with the same mass number.
Two atoms with different atomic numbers and same mass number.
Explanation
Isotopes are atoms of the same element that have the same atomic number but different mass numbers due to a different number of neutrons.
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