As you and a friend are entering a chemistry laboratory at your university, you see a sign that states: DANGER-RADIOACTIVE ISOTOPES IN USE. Your friend is an accounting major and has not had any science courses yet. She asks you what a radioactive isotope is and you respond correctly with:
A. Radioactive isotopes are atoms that are unstable and as a result emit energy in a process called radioactive decay.
B. Radioactive isotopes are atoms that are stable and as a result only emit energy if they are exposed to higher temperatures.
C. Radioactive isotopes are atoms that are stable and as a result emit energy in a process called radioactive decay.
D. Radioactive isotopes are atoms that are unstable but unless actively disturbed by some chemical process will remain intact and pose no problems.
Answer: A
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