Chemistry

Which of these is a heavy gas used in specialized electric lamps?

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From all salt elements, which group is most soluble?
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The noble gases that make up Group XVIII of the periodic table is also known as which of the following?
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What is known as the energy required to start a chemical reaction?
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Which substance has NaCl as its chemical formula?
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What does "ATP" stand for in chemistry?
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What color is ozone gas?
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Which of the following is a pH of an acid?
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In which emission is the most mass lost?
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