A feature of many of the isotopes that are used in the field of medicine is that the isotopes are radioactive. What does this mean?
A) The nucleus of the isotope is unstable and breaks down over time.
B) The same number of atoms are arranged into different molecular structures.
C) Cationic forms of the atom are used.
D) Anionic forms of the atoms are used.
E) The atoms with the greatest atomic mass are used.
Answer: A
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What will be an ideal response?
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