Atoms

Continuous theory of matter made by Aristotle and Plato, rejecting Democritus's theory and they believed that matter was infinite and divisible

440 BCE

Democritus came up with the idea of atoms or "atomos", meaning indivisible particles, this was also the discontinuous model.

370 BCE

Democritus came up with the idea of atoms

Dalton atomic theory, which was the first theory that described matter using atoms and their properties such as all atoms had the same mass.

1804

Thomson discovered the electrons in 1897, using the cathode ray experiment in which alpha particles bended towards a negative charge of electricity.

1897

JJ Thomson made plum pudding model of electrons scattered in the positively charged space.

1904

The nucleus of the atom was discovered by Rutherford and the nuclear atom model with neutrons and protons in nucleus were discovered in 1911

1911

Bohr Atomic model was with the electrons orbiting the nucleus was made in 1913

1913

Albert Einstein recognized photons, packets of electromagnetic radiation

1917

Erwin Schrödinger came up with the electron cloud model has dense nucleus with clouds of electrons that move like waves.

1926

Chadwick discovered the Neutron by using scattered data where he found the mass of the neutron in 1932

1932

Chadwick discovered the Neutron

Meitner discovered nuclear fission can produce massive amounts of energy. Nukes

1938

Goeppert-Mayer made the discovery of nuclear shell model for nucleus

1948

Discovery of nuclear shell model for nucleus

Quarks are the building blocks of positively or negatively charged atoms.

1964