Much of what we know about subatomic particles comes from directly observing the interior of the atom.
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Q139: A metalloid
A)is the same as a metal.
B)is
Q140: All noble gases have _ valence electrons.
A)three
B)five
C)seven
D)eight
Q141: Anions migrate toward the cathode.
Q142: Alpha particles are heavier than beta particles.
Q143: Solar fuels such as hydrogen are being
Q145: Radioactivity is the spontaneous emission of radiation
Q146: Most of the mass of an atom
Q147: Electrons occupy most of the volume of
Q148: Most of the mass of an atom
Q149: Which element is in the fourth period
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