Carbon 12

Why is carbon 12 considered an isotope if it has the same number of neutrons as protons?

I have always heard of an isotope defined as an atom with a different number of neutrons than protons. Carbon-12 however has 6 protons, 6 neutrons, and 6 electrons. Why is it always considered an isotope?

You have an incomplete definition of isotope. Isotopes are atoms that have the same number of protons as each other, but different numbers of neutrons.

C-12 is an isotope because C-13 and C-14 exist. All carbon atoms have 6 protons, but C-12 has 6 neutrons, C-13 has 7 neutrons and C-14 has eight neutrons.

In like fashion, we have O-16, O-17 and )-18. Another example would be U-238, U-235 and U-233

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