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400 BCE
Demócrito
He was the first to introduce the idea that matter is made up of indivisible basic elements, called "atoms." -
John Dalton
He postulated that matter is made up of very small particles called atoms, which are indivisible and cannot be destroyed. Atoms of the same element are equal to each other, have the same mass and equal properties. -
J. J. Thomson
It is a theory about atomic structure; The atom is composed of negatively charged electrons in a positive atom, embedded in it as well as raisins in a pudding. -
Jean Perrin
He found that cathode rays deposited charge on an electroscope, confirming that they were charged particles. -
Rutherford
He postulated that the mass of the atom was concentrated in a small region in the scepter and in its crust electrons were found spinning around the center. -
Bohr
He proposed a atomic model where the electrons they revolve around core in levels well defined. -
Sommerfeld
He modified Bohr's model, said electrons could also rotate in more complex elliptical orbits. -
Schrödinger
He proposed a atomic model where the electrons they revolve around core in levels well defined. -
Heisenberg
Model based on the Principle of uncertainty (It is impossible to determine the speed and position of a electron instantly)
