Physics for IGCSE & O level - Atoms And Radioactivity (Section 7 - No. 48)
What is an isotope?
An atom with a different number of protons.
An atom with a different number of electrons.
An atom of the same element with a different number of neutrons.
A molecule of the same element.
Explanation
Isotopes have the same number of protons but different neutrons.
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