A hospital buys a compound that contains an isotope of barium. Several months later, most of the barium has changed to the

Question

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?
reactions with the container wall
exposure to air
radioactive decay
absorption of moisture from the air

Kunduz · Accepted Answer

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