Chemistry

What is the second most abundant element by mass (about 18.5%) in the human body?

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Sodium on the periodic table is noted by which symbol?
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What is the most commonly encountered form of silver?
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Which of the following is an element?
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Which element has the lightest atomic weight?
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What is the symbol used on the periodic table for the element Promethium?
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What two common ingredients cause an observable chemical reaction when mixed?
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What element has the highest ionization energy?
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What is the chemical symbol for Potassium?
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