Half of the nuclei of the atoms of a radioactive substance decay into the nuclei of other substances over time. This period of time is called the substance's half-life. The half-life of radon gas released from soil, radon-222, is [[$ 3.8 $]] days. The mass of a container of radon-222 is initially [[$ 1000 \; \ text {g} $]]. How much will the radon-222 weigh after

a) [[$ 3.8 $]] days?

Answer: After [[$ 3.8 $]] days, there will be g of radon-222.

b) [[$ 7.6 $]] days?

Answer: After [[$ 3,8 $]] days, there will be g of radon-222.

c) [[$ 38 $]] days?

Answer: After [[$ 3,8 $]] days, there will be g of radon-222.

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