History of the atom: Nick Bowman

Dalton

Nov 20, 1803

Dalton Thought that elements were made of smaller invisible parts of matter or atoms. He made the idea of the atom useful.

Crookes

Nov 20, 1879

Crookes helped actually discover the electron using a cathode ray and then renaming it as the crooke’s tube.

Thomson

Nov 20, 1897

Found that atoms were not simple solid spheres. Discovered that electrons have a negative charge.

rutherford

Nov 20, 1911

He Developed a better understanding of the atom he found that most atoms are mostly made of space. Small dense positively charged center or the nucleus. Compared the nucleus to a marble in a stadium.

Bohr

Nov 20, 1913

Electrons orbit around the nucleus and have a fixed amount of energy. Energy levels. Can be compared to rungs on a ladder. The amount of energy increases the farther you get from the nucleus.

Schrodinger

Nov 20, 1926

Showed that electrons can be regarded as particles and waves and actually don’t move. Helped contribute to the electron cloud model. Where the electrons would probably be found around the nucleus

Chadwick

Nov 20, 1932

Before 1932 people thought that the atom only consisted of protons and electrons.Chadwick helped discover the neutron and find that the electron wheighed almost nothing and contributed very little to the atomic mass of an atom and that the wheight of an atom mainly consited of protons and neutrons.

Heisenburg

Nov 20, 1958

He discovered Electrons don’t travel in neat orbits. Also saw that Electrons contain photons. Finally he Calculated behavior of electrons