Chemistry
Which element is a poisonous gas that combines with sodium to form table salt?
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What allotrope of oxygen helps protect the biosphere from solar ultraviolet radiation?
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What isotope of carbon can be used to figure out how old some objects are or when something died?
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What symbol appears on the periodic table for the element with the atomic number 100?
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What symbol appears on the periodic table for Calcium which has the atomic number 20?
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The dumping of most toxic chemicals into the ocean was banned by what treaty?
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Orange street lighting is orange because of the presence of what element in the lamp?
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