One of a related set of atoms

• One of two nuclides with the same neutron number but different proton numbers
• One of a group of atoms having the same number of neutrons but a different number of protons
• Either of two atoms with equal number of neutrons but not equal protons
• Type of atom
• Nuclide

Wiktionary Word definitions in Wiktionary
n. (context physics English) either of a number of nuclides of different elements that have the same number of neutrons

Wikipedia Word definitions in Wikipedia
This article is about a concept in nuclear physics. For biochemistry see Isotonicity . For the mathematical meaning, see monotone . Two nuclides are isotones if they have the very same neutron number N , but different proton number Z . For example, boron-12 ...