Which of the Following is True of Iodine and Radioactive

Question

Which of the following is true of iodine and radioactive iodine?
A) Both have the same atomic numbers.
B) Both have the same atomic masses.
C) Neither has electrons in its orbit.
D) Both create radiation hazards.

Accepted Answer

Iodine and radioactive iodine share the same atomic number because they are isotopes of each other, differing only in the number of neutrons and not in the number of protons (which determines the atomic number).