What's an isotope?
A)a radioactive material
B)an atom of an element with a different number of neutrons in the nucleus
C)an electrically charged atom
D)none of the above

Question

Quizplus · Accepted Answer

An isotope is an atom of an element with a different number of neutrons in the nucleus. This means that isotopes of the same element have the same number of protons (and therefore the same atomic number), but different numbers of neutrons (and therefore different atomic masses).

What's an Isotope