Discovery of the atom by Cody Ward

Democritus

Jan 1, 1000

Thought of the idea of atoms and that they could not be created, destroyed, or further divided.

Aristotle

Jan 1, 1005

Could not believe that the “nothingness” of empty space could exist

First Hospital in North America

Jan 1, 1503

First hospital in North America was built in 1503 in Santo Domingo.

First car

Jan 1, 1769

First car was made in 1939.

Joseph Proust

Jan 1, 1799

Proposed the the Law of Constant Composition in 1799. This law was very radical at the time and was hotly contested by Claude Berthollet.

John Dalton

Jan 1, 1805

Revised Democritus’s ideas based upon the results of scientific research
Dalton’s Atomic Theory
• All matter is composed of extremely small particles called atoms.
• All atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element are different from those of any other element.
• Atoms cannot be created, divided into smaller particles, or destroyed.
• Different atoms combine in simple whole- number ratios to form compounds.
• In

Amadeo Avagadro

Jan 1, 1811

Proposed what is now known as Avogadro's Hypothesis in 1811. The hypothesis states that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. When this is combined with Gay-Lussac's Law of Combining Volumes, the only possible formulas for hydrogen, oxygen and water are H2, O2 and H2O, respectively. The solution to the atomic weight problem was at hand in 1811.

Civil War

Jan 1, 1861

The United States went to battle with our own people.

William Crookes

Jan 1, 1870

Constructed this forerunner of the modern television picture tube to investigate the properties of cathode rays.

First Movie

Jan 1, 1878

The Horse in Motion was the first movie made.

First lightbulb

Oct 22, 1879

The first lightbulb was made.

Henri Becquerel

Jan 1, 1896

While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.

J. J. Thomson

Jan 1, 1897

First to discover the electron.

Madam Curie

Sep 29, 1898

Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.

Albert Einstein

Jan 1, 1905

Published his famous equation E=mc 2.

Robert Millikan

Jan 1, 1908

Dealt with the fundamental constituents of the of the universe, the forces they excert on one another, and the results produced by these forces.

Ernest Rutherford

Jan 1, 1909

Became a Nobel laureate for his pioneering work in nuclear physics for his theory of the structure of the atom.

World War 1

Jun 28, 1914

A world wide war.

First color movie

Jan 1, 1918

Cupid Angling was the first color movie.

Henry Bohr

Jan 1, 1922

Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.

Louis deBroglie

Jan 1, 1923

Discovered that electrons had a dual nature- similarto both particles and waves. Particle/wave duality. Supported Einstein.

Werner Heisenburg

Jan 1, 1927

Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy- you can not know both the position and velocity of a particle.

James Chadwick

Jan 1, 1931

Measured the energy of the protons emerging form the hydrogen atoms.

World War 2

Jan 1, 1939

The 2nd world wide war.

First microwave

Jan 1, 1947

First microwave was built.

First Computer Company

Jan 1, 1949

J. Presper Eckert and John Mauchly made the first computer company.