instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Tornadoes can occur in any.
answer:
At what time of the year can tornadoes occur?


question:
Radioactive decay can give off energy and particles.
answer:
Radioactive decay can give off energy and what else?


question:
Four valence electrons can be found in a carbon atom.
answer:
How many valence electrons can be found in a carbon atom?