Chemistry

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

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What element was known in ancient times and referred to in Genesis as "brimstone"?
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Which of these is a significant greenhouse gas?
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What post-transition metal is used to make blue and violet light-emitting diodes (LEDs) and diode lasers?
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Felix Hoffmann, not Bayer, first patented what remedy?
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What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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All of the halogens form acids when bonded to what element?
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What state of matter takes a shape of its own?
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What will happen to most matter that is heated?
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