MCAS Biology Practice

Category - Chemistry

A hospital buys a compound that contains an isotope of barium. Several months later, most of the barium has changed to the element lanthanum. Which of the following is responsible for this change?
  1. exposure to air
  2. radioactive decay
  3. reactions with the container wall
  4. absorption of moisture from the air
Explanation
Answer: B - radioactive decay
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