Chemistry

Which of these is an element?

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In RNA thymine from DNA is replaced by what?
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What group of elements include lithium, sodium, potassium, rubidium, cesium, and francium?
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Which of these is used to determine the strength of a chemical bond?
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What symbol appears on the periodic table for the element with the atomic number 14?
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A critical component of vitamin B-12, what element is the only metal found in vitamins?
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What is H20 more commonly known as?
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Which of the following is chemical energy labeled as?
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What element in a liquid state is used in the cryogenic cooling of devices and materials?
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