Chemistry
What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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What gas in excited state is responsible for the bright red and yellow-green colors of the aurora?
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What element does hydrogen combine with to make the compound water?
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What is the second most common metal on Earth, and the most widely-used metal?
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What symbol appears on the periodic table for the element with the atomic number 100?
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