Atomic Model

Democritus

400

Democritus was one of the first people who proposed the atomic model in the fifth century B.C. Democritus atomic model was a round sphere with no electrons, protons, or neutrons. By Democritus created the first atomic model it helped people with understanding the idea of an atom, and helped other scientists further look into the science of the atom and its genetic makeup.

Dalton

1803

in 1803, Dalton created the first chart of atomic weights. He first research projects, was in meteorology. He started keeping daily logs of the weather, paying special attention to details such as wind velocity and barometric pressure. He later became interested in gases. His experiments on gases led to his discovery that the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space.

J.J Thomson

1897

In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. The experiment he conduct was the Plum pudding experiment.

RutherFord

1911

In 1911 Rutherford demonstrated that the atom had a tiny and heavy nucleus. He designed an experiment to use the alpha particles emitted by a radioactive element as probes to the unseen world of atomic structure. The model of the atom is attributed to Rutherford is the Gold model theory. The Gold model basically showed that some particles bounced of the gold and deflected.

Neils Bohr’s Model of the Atom

1913

In 1913 Bohr discovered that a positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus

Erwin Schrödinger

1926

In 1926 Erwin Schrödinger used mathematical equations to describe the finding of an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom. Unlike the Bohr model, the quantum mechanical model does not define the exact path of an electron but it predicts the odds of the location of the electron.