1 jan 1803 ano - John Dalton

Descrição:

After Democritus, the development of the atomic model was largely stagnant until John Dalton, a British scientist born in 1766 (Ross, 2020).

Like Democritus, he believed that matter was made of indivisible and indestructible atoms (Ross, 2020). According to his theory, different elements vary in size and mass and have different chemical properties, but atoms of the same element are identical in mass and properties (Purdue University, n.d.).

Dalton also believed that compounds were formed by two or more different elements rearranging in certain ratios involving whole numbers of atoms (Lumen Learning, n.d.). With this belief, he attempted to determine the relative mass of each type of atom, with some degree of success (Ross, 2020). He also compiled a list of the known elements and introduced symbols for them (Lumen Learning, n.d.).

Dalton made these conclusions with experimentation and examination of the results, so he is credited with the first scientific atomic model (Lumen Learning, n.d.). He published his atomic model in 1803.

Dalton's contributions to the atomic model were to be refined by future scientists, but they were conducive to further advances in the fields of chemistry and physics. For this, he earned the sobriquet, 'father of chemistry' (Ross, 2020).

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