Cheimstry (Scientists) Timeline [Some inventors may have their birthdate as the date on their history mark]

Aristotle

400

Didn't think there was an atom.

Democritus

460

The differing properties of matter are due to size, shaping, and movement of atoms, was Democritus' idea of atoms.

Timespan

Period: 460 to Sep 20, 2012

Leonardo da Vinci

Sep 25, 1474

Atoms are held together with attractions, also called forces.

Johannes Kepler

Sep 26, 1571

German mathematician, atronomer, and astrologer. Law of Planetary motion,
First Law: Planets move around the Sun in ellipses, with the Sun at one focus
Second Law: The line connecting the Sun to a planet sweeps
equal areas in equal times.
Third Law: The square of the orbital period of a planet is proportional to the cube of the mean distance from the Sun

Galileo Galilei

Sep 26, 1609

Made a telescope model and discovered mountains and valleys on the moon.

Issac Newton

Sep 26, 1687

Discovered gravity, with the help of Francis Crick.

Antonie Lavosier

Sep 23, 1743

Determined that water results from the combination of the elements oxygen and hydrogen.

Joseph Proust

Sep 25, 1754

Introduced glucose- Proust's Law- disproving Law of def. Awarded Nobel Prize.

John Dalton

Sep 23, 1776

Atoms cannot be created, divided into small particlesm or destroyed.

Amadeo Avagardo

Sep 25, 1776

Contributed to molecular theory, known as Avagardo's Law.

William Crooks

Sep 25, 1800

Invented cathode ray, that was later transmitted into a Television set.

J.J. Thomson

Sep 23, 1856

Discovered the electron.

Heinrich Hertz

Sep 25, 1857

German chemist who clarified & expanded James Maxwell's electromagnetic theory of light.

Alfred Nobel

Sep 25, 1866

Inventor of dynamite, while also a Swedish Chemist, engineer, and armaments manufacturer.

Alfred Nobel

Sep 25, 1866

Inventor of dynamite, while also a Swedish Chemist, engineer, and armaments manufactrurer.

Robert Millikan

Sep 25, 1868

Determined the change of an electron.

Ernest Rutherford

Sep 23, 1871

Student of J.J. Thomson; postulated the nuclear structure of the atom.

Albert Einstein

Sep 25, 1879

Developed the general theory of relativity effecting a revolution in physics.

Henry Moseley

Sep 23, 1887

Justification from physical laws of the previous empirical and chemical concept of the atomic number.

Max Planck

Sep 25, 1900

Quantum theory of radiation.

Henri Becquerel

Sep 25, 1903

Discovered radioactivity, winning the Nobel Prize.

Wilbur & Orville Wright

Dec 17, 1903

The "Flyer" flew for 12 seconds, taking place at Kitty Hawk, NC. First flight for planes.

Madame Curie

Sep 25, 1911

Discovered the radioactive elements; polonium and radium.

Gerturde Elion

Sep 25, 1918

Deliberately designing molecules with specific molecular structures.

Louis de Broglie

Sep 25, 1924

Matter & wave particle auality, non-nulity, & varability of mass.

Erwin Schrodinger

Sep 25, 1926

Quantum mechanical model of the atom.

Werner Heisenburg

Sep 23, 1932

Awarded Nobel Prize for Physics, "for the creation of the quantum mehcanics."

James Chadwick

Sep 25, 1932

Showed the nucleus also contained an electron.

Niels Bohr

Sep 23, 1933

Developed the concept of complementarity.

Otto Hahn

Sep 25, 1938

Became the first, along with three other men, to recognize that the uranium atomm when bombarded by neutrons, split.

James Watson

Sep 26, 1953

Co-discoverer of the DNA structure with Francis Crick.