chemistry research
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1.) Rutherford used a very thin sheet of gold as a target. On one
side of the foil was a lead box containing a radioactive particle. A
small hole in the box permitted a narrow stream of alpha particles to
shoot out. These particles were directed at right angles to the
surface of the foil. Surrounding the foil was a screen coated with
zinc sulfide. Each time an alpha particles hit this coating, a flash of
light, it was possible to see whether the alpha particles that passed
through the foil had been deflected.
2.) Before 1961, there actually were two sets of atomic masses. One
scale was used by physicists; the other by chemists...