Democritus and Dalton both proposed a model of atom which sounded very similar. Both basically claimed that every element's fundamental unit (Atom) is indivisible . But Dalton proposed the model after a few centuries. So what was different between their models.

There was no difference. Dalton said the same thing but since he was a scientist he was believed strongly.

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Democritus was a Greek philosopher his model was based on philosophy and no scientific evidence while Dalton's was a calculated guess based on laws given by his peers.

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Solution

The correct option is B Democritus was a Greek philosopher his model was based on philosophy and no scientific evidence while Dalton's was a calculated guess based on laws given by his peers.
Democritus model was a part of his philosophy, he didn't verify it, well he couldn't, given that he didn't have access to the sophisticated tools that we have now. Whereas Dalton's postulates were based on observations and laws given earlier by Proust and Lavoisier. Law of constant mass and law of constant proportion were the stepping stone for Dalton's atomic theory.
So Dalton took a good calculated guess at his model.

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