TIMELINE

TIMELINE

1. 1808

   • Dalton's atomic model emerged in the context of chemistry, it was the first scientifically based atomic model, formulated in 1808 by John Dalton.

2. 1904

   • Joseph J. Thomson proposed a very elementary model: the atom is made up of a sphere of matter with a positive charge, in which electrons are found embedded in sufficient numbers to neutralize its charge.

3. 1911

   • Ernest Rutherford In his atomic model, Rutherford proposed that atoms have a central nucleus where the greatest percentage of their mass is found.

4. 1922

   • Bohr was the first to apply quantum theory to the problem of atomic and molecular structure.

5. 1926

   • Schrödinger's atomic model was developed in 1926. It is the quantum mechanical model of the atom based on the Schrödiger equation.

6. 1935

   • his main contributions were in the field of nuclear physics since he discovered an atomic particle without charge in the nucleus of the atom, known today as a neutron. In 1935 he received the Nobel Prize in Physics.
   • Chadwick also discovered tritium.