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AP7396 - $38.60
Except for a very few elements, no atoms of any element have the atomic mass listed in the periodic table. This is due to the existence of isotopes. In this demonstration with an overhead projector, steel spheres are magnetically separated by mass...
AP7425 - $47.10
Many of the experiments that led 20th century scientists to discover the nature of the atom involved indirect observation and inference. During the early 1900s, scientists such as J. J. Thomson and Ernest Rutherford were faced with the challenge to...
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