Chemistry

What element has an atomic number of 40?

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What is the half-life of Rubidium-Strontium 87?
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What is known as the energy required to start a chemical reaction?
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The Diels-Alder reaction is an example of which class of reactions?
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What is a mixture of gases that can be stored and transported like natural gas?
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Lutetium on the periodic table is noted by which symbol?
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What is a vital constituent of plant and animal life, and is the key component of hemoglobin?
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What device controls temperature with a switch?
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Which of these is an element?
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