These are the nuclides having the same numbers of neutrons (N) but a different Z and A. Example of Isotones are 136 C and 147 N. Isotones having a given value of N, obviously do not all corresponding to the same chemical element.
The analysis of the properties of isotones and isobars helps us to disclose several features of atomic nuclei. Such analysis helps us to predict that what will happen to the stability of a nucleus when an extra n or p is needed to the nucleus.
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