Chemistry
What symbol appears on the periodic table for the element with the atomic number 92?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What symbol appears on the periodic table for the element with the atomic number 62?
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What three components are needed in order to produce fire?
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What is the most abundant element in the known universe?
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When wood has been heated to remove almost all volatile gases and leave the carbon, it is called what?
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A tincture of iodine solution means that iodine is dissolved in which substance?
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What element does hydrogen combine with to make the compound water?
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A lack of iodine in your diet leads to which medical condition?
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