Humphry Davy was able to discover six elements by using a new invention called the ______________.
Correct Answer:
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Q134: A(n) _ is a substance composed of
Q135: The three allotropes of carbon are graphite,
Q136: Hydrogen, nitrogen, and chlorine are among the
Q137: Group _A elements have two valence electrons.
Q138: Earth's atmosphere is 78% _.
Q140: An electrically neutral particle composed of two
Q141: The horizontal rows of the periodic table
Q142: An aqueous solution of the colorless gas
Q143: The amount of energy necessary to remove
Q144: Over 99.9% of dry air at sea
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