Isotones have sameAmass numberBnuclear massCno. of neutronsDno. of electronsAnswer: C. no. of neutrons Read Explanation: Isobars are elements that have the same mass but a different atomic number. Isomers are elements that share the same chemical formula but have distinct structures. Isotopes are elements that have the same atomic number but differ in their atomic mass.Isotones are atoms of different chemical elements with an equal number of neutrons in the atomic nucleus. Read more in App