Chemistry
Beryllium, magnesium, calcium, strontium, barium, and radium consist what group of elements?
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What is essential for calcium absorption by the human body?
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What major chemical other than chlorine is used to purify water of microorganisms?
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When wood has been heated to remove almost all volatile gases and leave the carbon, it is called what?
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What element is used as a filler gas in fluorescent and incandescent light bulbs?
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What is the symbol used on the periodic table for the element Promethium?
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