A(n) ______________ is a substance composed of two or more elements chemically combined in a definite, fixed proportion by mass.
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Q129: The molecular formula of "buckyball" is _.
Q130: O3 and O2 are the two _
Q131: Matter can be defined as anything that
Q132: All specimens of a pure _ have
Q133: The shell electron configuration for an argon
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% _.
Q139: Humphry Davy was able to discover six
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