The atom has been suggested as the smallest complete part of matter since the cartridge holder holder of the ancient Greek philosophers only if they did not endure a clear picture of the nature of the atom or any possible structure because of limitations to their scientific knowledge. Dalton was a scientist who suggested in 1810 that the important feature of atoms is that an element is a pure bone marrow because it contains analogous atoms. This was the first time that atoms were regarded as identifiably incomparable because Dalton withal proposed that atoms of divergent substances were disparate to each other, particularly because they had different nuclear mass. Â Â Â Â Â Â Â Â Daltons theory lead him to alike suggest that compounds consisted of different elements whose atoms had been combine together and he on that pointfore also tell away the idea that different compounds remained consistent in the proportion of the elements involved. Dalton also suggested that chemical equations occurred when combination of atoms were rearranged. Daltons sham is shown below The chore with Daltons prototype is that it regarded atoms as units without structure and it needed further seek to show that his illustration was defective. Thomson in 1904 put forward a model, which suggested that there were sub-atomic particles.

Thomson suggested the atom consists of a positively aerated liquified in which negative electrons ar embedded in the resembling way that fruit git be found throughout the ball of a pudding. For this reason, Thomsons model is sometimes referred to as the fai rly pudding model. This model was incorrect ! in the way that he imagined that an atom was structured but the important contribution was recognising that there were negatively charged particles much(prenominal) as electrons, which were balanced against positively charged material. Thomsons model is illustrated below This model was supported by Thomsons try out using a cathode... If you want to get a expert essay, order it on our website:
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