Physics for IGCSE & O level - Atoms And Radioactivity (Section 5 - No. 12)
What is an isotope?
An atom with a different number of protons.
An atom with a different number of electrons.
An atom with the same number of protons but a different number of neutrons.
An atom with a different number of neutrons.
Explanation
Isotopes have different number of neutrons.
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