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https://www.youtube.com/watch?v=wsYDL6EjV4k
Atoms of different elements are different. All atoms of the same elements are alike. -
He noticed a movement a movement in a tube. He called the movement cathode rays.
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https://www.youtube.com/watch?v=Zd6_zVdMgJk
Atoms are made of a small positive nucleus. atoms are mostly empty space.
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