Isotope
/ˈaɪ.sə.təʊp/
"Isotope" in a Sentence (2 examples)
The principal natural isotope of aluminium is aluminium-27.
This element, considered to be radioactive and classified as a metal, is artificially produced by bombarding atoms of americium-243—an isotope of the element Americium (Am)—with ions of a rare isotope calcium-48 using a device called a cyclotron.