Which element, known for its use in light bulbs, has an atomic number of 86?
Category: Knowledge · Difficulty: hard
Hint: This element is a noble gas.
Answer
Radon
Explanation
Radon is a noble gas with atomic number 86, primarily used in radiation therapy and as an indicator of geological activity.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Radon.
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