Chemistry
What element has an atomic number of 40?
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What symbol appears on the periodic table for Calcium which has the atomic number 20?
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While acids dissolve most metals, what special mixture of acids is used to dissolve gold?
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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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How many elements with atomic number below 100 have their symbols starting with an upper case T?
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