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Question 10.1: Iodine-123 and iodine-131 are radioactive isotopes used for ...

Iodine-123 and iodine-131 are radioactive isotopes used for the diagnosis or treatment of thyroid disease. Complete the following table for both isotopes.

Analysis

• The atomic number = the number of protons.

• The mass number = the number of protons + the number of neutrons.

• Isotopes are written with the mass number to the upper left of the element symbol and the atomic number to the lower left.

Atomic Number Mass Number Number of Protons Number of Neutrons Isotope Symbol
Iodine-123
Iodine-131
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Atomic Number Mass Number Number of Protons Number of Neutrons Isotope Symbol
Iodine-123 53 123 53 123 − 53 = 70 \begin{array}{r}123 \\53\end{array}I
Iodine-131 53 131 53 131 − 53 = 78 \begin{array}{r}131 \\53\end{array}I

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