An atom with a specific arrangement of electrons, neutrons, and protons is identified as an isotope due to the differing number of neutrons.
An atom with 12 electrons, 13 neutrons, and 11 protons is an isotope. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. In this case, the variation in the number of neutrons makes it an isotope.
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