jun 1, 1904 - Sir Joseph John Thomson creates the "pudding model"

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Thomson, much earlier in 1897 discovered that 'cathode rays' (a beam emitted from a very low -pressure tube, a vacuum). Upon closer inspection and many calculations, he found the electron, the first sub-atomic particle was found- Thomson also noted that it had a very high negative charge for its size. He realised that there must also be a counter-acting positive charge. Thus, he made the "pudding model".

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