Last revised by Pir Abdul Ahad Aziz Qureshi on 29 Sep 2021

Isotones are atomic species that share the same number of neutrons and differ in the number of protons.

Examples of isotones include carbon-12, nitrogen-13 and oxygen-14. These atoms all have six neutrons and six, seven and eight protons respectively.

A mnemonic that can be used to differentiate isotones from isotopes and isobars is as follows:

  • same Z (number of protons) = isotopes
  • same A (number of nucleons) = isobars
  • same N (number of neutrons) = isotones

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