Atomic Theory

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Red text is historical events, blue text is scientists

Printing Press

1440

The Gutenberg printing press was invented.

Discovery of the Americas

1492

This is when the Americas became discovered.

Reformation of the Catholic Church

1527

Galileo was convicted of heresy

1633

Joseph Priestly discovered oxygen, carbon monoxide, and nitrogen dioxide

1774

Declaration of Independence

1776

The Declaration of Independence was signed.

Antoine Lavoisier came up with the law of conservation of mass

1785

He is also known as the father of modern chemistry

Alessandro Volta discovered electrochemical cells and batteries

1800

John Dalton proposed the Law of Simple Multiple Proportions

1803

Michael Faraday had an experiment

1831

In this experiment he discovered electromagnetic induction with electrochemistry

Civil War

1861

Alfred Nobel invented dynamite

1863

He also left a fund for the Nobel Prize.

First transcontinental railroad in US

1869

Eugen Goldstein discovered positive particles

1885

He discovered these using a tube filled with hydrogen gas

Pasteur Institute was inaugurated in Paris for treatments

1888

The treatments were for rabies and other diseases

Guglielmo Marconi transmitted electrical signals

1895

Henri Becquerel preformed an experiment with radioactivity

1896

JJ Thomson discovered the electron

1897

Created the plum pudding model, and discovered cathode rays deflected by charged plates.

Ernest Rutherford discovered the nucleus

1898

Discovered atoms are mostly empty space.

Max Planck discovered matter absorbs or emits energy as quanta

1900

He came up with the equation E=hv

Albert Einstein proposed his Theory of Relativity

1905

Einstein discovered the photoelectric effect. Also, that blue light phtons have more energy than red light photons.

Robert Millikan measured the charge of an electron

1908

Marie Curie contributed to the study of radioactivity

1910

Neils Bohr came up with a diagram that shows how the atom works

1913

His diagram shows that the nucleus is in the middle with a specific number of protons and neutrons and the outer layers are made up of a certain number of electrons.

Henry Mosley used the application of x-ray spectra to study atoms

1913

He discovered that an element is determined by the number of protons in the nucleus.

Assassination of Archduke Ferdinand

1914

Bolshevik Revolution

1917

Treaty of Versailles

1919

Sir Frederick Banting isolated insulin

1922

Louis deBroglie discovered that electrons can act as waves

1924

Also made up the equation, λ = h/mυ.

Werner Heisenber created matrix mechanics

1925

Came up with the uncertainty principle. Also discovered that you can not know both the position and velocity of a particle.

Erwin Schrodinger invented the quantum model of an atom

1926

He discovered that atoms have electron orbitals, there are energy sublevels for electrons, orbitals have shapes, and the quantum numbers. He also discovered wave functions and proabability theory.

Philo Farnsworth produced the first television transmission

1927

James Chadwick proved the existence of neutrons

1932

Wallace Carothers discovered neoprene and nylon

1934

Leo Szilard proved that nuclear reactions are possible

1934

Bombing of Pearl Harbor

1942

Initial concept for world wide web (internet)

1962

First cellular phone

1973

Kary Mullis invented the polymerase chain reaction

1985