In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: Which orbitals do electrons fill first? Answer: closest to the nucleus

A: Closest to the nucleus orbitals do electrons fill first.
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Q: Question: What are the winds that occur in belts that encircle the planet? Answer: global winds

A: Global winds are the winds that occur in belts that encircle the planet.
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Q: Question: The decay rate is measured in a unit called the what? Answer: half-life

A:
The decay rate is measured in a unit called the half-life.
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