Chemistry

What symbol appears on the periodic table for Calcium which has the atomic number 20?

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What is the chemical term for a peptide; two amino acids linked together?
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Selenium came from the Greek word "selene", which means what word in English?
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Which atomic particle is outside the nucleus?
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Which of these is the primary component of natural gas?
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Which element has the lightest atomic weight?
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What heat is released during a change of state?
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How many electrons are in the third ring of the atom Chlorine?
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Which of the following is a metal?
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