Chemistry
Orange street lighting is orange because of the presence of what element in the lamp?
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Silver chloride and silver nitrate are both chemicals that darken with exposure to what?
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What symbol appears on the periodic table for Beryllium which has the atomic number 4?
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What element gets its name from the Greek word "kryptos" meaning "the hidden one"?
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What alkali metal is highly radioactive and decays into either astatine, radium, or radon?
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