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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