Chemistry
What is the second most abundant element by mass (about 18.5%) in the human body?
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What symbol appears on the periodic table for the element with the atomic number 106?
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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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The first element on the periodic table of elements with an atomic number of 1 is?
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Which of the following activities is an example of changing a physical property?
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What contain most of the calcium ion in the human body?
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