Created by StemPy LabUranium-238 () decays through a long chain of alpha and beta (electron) decays and ends as stable lead-206 (). The number of alpha particles given out along the whole chain is ____.
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← Two plane mirrors are placed with their reflecting faces at 45° to each other, with their edges touching. A small object is placed between them, away from the line where they meet. The number of images formed is ____.In a new system of units, the unit of force is 100 N, the unit of length is 10 m, and the unit of time is 100 s. In this system, the unit of mass is equal to →
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