Select the correct statement about isotopes.
A) All the isotopes of an element have the same number of neutrons but differing numbers of electrons.
B) Isotopes of the same element have the same atomic number but differ in their mass number.
C) All the isotopes of an element are radioactive.
D) Isotopes occur only in the heavier elements.

Question

Quizplus · Accepted Answer

Isotopes of the same element have the same atomic number (number of protons) but differ in their mass number (number of protons and neutrons). This means that isotopes of an element have the same number of electrons and chemical properties, but different physical properties due to their differing masses. The statement in option A is incorrect, as isotopes differ in their number of neutrons. The statement in option C is incorrect, as not all isotopes are radioactive. The statement in option D is incorrect, as isotopes occur in all elements, not just the heavier ones.

Select the Correct Statement About Isotopes