What is matter made of? Since Antiquity, the human being has asked this question, philosophers such as Empedocles, Democritus  and Aristotle established different explanations to answer this question. However, it is not until the beginning of the 19th century, when the chemist J. Dalton, establishes the first atomic theory.

 

Subsequently, due to a series of discoveries (electron, atomic nucleus,...), this theory has been modified until reaching the current atomic model based on quantum mechanics.

 

The 3rd ESO students have made some models of 4 atomic models: Dalton, Thomson, Rutheford and Bohr to better visualize and understand each of them.