Radioactivity is the spontaneous emission of radiation from an unstable element.
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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.
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Q146: Most of the mass of an atom
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Q148: Most of the mass of an atom
Q149: Which element is in the fourth period
Q150: How does the periodic table substantiate atomic
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