What was one important discovery that the Curies made?
A. A material’s radioactivity cannot be changed by altering the material physically.
B.A material’s radioactivity can be weakened or intensified by changing it C.chemically. Radioactive materials generally contain radium or polonium. D.Radioactive materials are found only in the form of salts.
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A. A material radioactivity cannot be changed by altering the material physically
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