isotopea variant of a chemical element that differs in neutron numberCarbon-14 is a radioactive isotope used in archaeological dating of organic materials.NoteCarbon-14 is a radioactive isotope used in archaeological dating of organic materials.Elon.io is an online learning platformWe have an entire course teaching IELTS Vocabulary — Band 7+ grammar and vocabulary.Start learning IELTS Vocabulary — Band 7+ now