atoms with the same number of protons but different numbers of neutrons

Atoms with the same number of protons but different numbers of neutrons are called isotopes.

Quick Scoop

• All atoms of a given element have the same number of protons; this fixed number is the element’s atomic number and defines which element it is (for example, all carbon atoms have 6 protons).

• Some atoms of that same element can have extra or fewer neutrons in the nucleus, changing their mass but not their chemical identity; these variants are isotopes of that element.

• A classic example is carbon: carbon‑12, carbon‑13, and carbon‑14 all have 6 protons, but 6, 7, and 8 neutrons respectively, so they are different isotopes of carbon.

In short, whenever two atoms share the same proton count yet differ in neutron count, they are isotopes of the same element.

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