The explanation for the fact that radioactive isotopes of an element exhibit the same chemical behavior as the stable isotopes of the element is that each has the same:

a. atomic number.

b. number of neutrons.

c. mass number.

d. atomic weight.

Answer:

a. atomic number

Explanation:

Radioactive isotopes of an element have the same chemical behavior as the stable isotopes of the element due to the fact that they have the same atomic number with that of the stable isotopes of the element. The atomic number determines the electron number and configuration of an element.

Electron number and their arrangement determine the chemical behavior of an element, as they determine how the element interacts and form bonds.