History of the Atom

Aristotle

322

Aristotle proved that atoms move through any empty space as he didn’t believe in nothingness.

Democritus

442

Democritus created the word atom. He also worked out that matter was made of atoms.

Robert Boyle

Jul 1, 1661

Robert Boyle created a law to do with pressure and volume. The law is as follows: if the pressure is small, the volume is great; if the pressure is large, the volume is small

Antonine Lavoisier

Mar 18, 1777

Antoine La Voisier found that elements are broken down into simpler substances.

Antonine Lavoisier

Mar 19, 1777

Antonine Lavoisier created the Law of Conservation of Matter.

Joseph Proust

Oct 4, 1799

Joseph Proust created the laws that have a relation to compounds.

Dalton

Oct 19, 1803

Dalton found that matter is very small, as it can’t be broken down to anything smaller than what it is.

Thomson

Nov 6, 1897

Thompson found that atoms are made up of even smaller parts and that they are dividable.

Rutherford

Oct 19, 1898

From studies, Rutherford found that the atom is mostly empty space.

Marie and Perrie Curies

Nov 2, 1898

Marie and Perrie Curies discovered elements that are now part of the Periodic Table.

Henry Mosley

Jun 29, 1913

Mosley discovered that each atom has a different positive charge in the nuclei.

Robert Millikan

May 25, 1917

Robert Millikan performed an experiment with led to him finding the charge of one electron.

Bohr

Oct 20, 1922

Bohr concluded that a shell made of electrons surrounds the atoms.

Schrodinger

Apr 4, 1926

The scientist Schrodinger found that you could use an equation to get a rough idea of where an atom is.

Chadwick

Oct 20, 1932

Chadwick found the neuron.