Chemistry

Which noble gas has "A" as its first letter?

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Which atomic particle is outside the nucleus?
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What sort of change happens to a head of lettuce when you cut it in half?
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What gas makes up most of the atmosphere of Mars?
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Which of the following carries a negative charge?
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Which of these is an element?
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The Diels-Alder reaction is an example of which class of reactions?
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Nitrogen on the periodic table is noted by which symbol?
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What symbol appears on the periodic table for the element with the atomic number 14?
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