Chemist History Timeline

Democritus Create 1st Idea of an Atom

460

• BCE
• non specific date
• believe all matter composed invisible particles "atoms"
• different sizes and properties

Beginning Rome

Oct 13, 750

• BCE
• BEFORE DEMOCRITUS BECAUSE BCE IS BACKWARDS

Columbus Sails the Ocean Bue

Aug 3, 1492

Death of DaVinci

Mar 17, 1519

Issac Newton Published Three Laws of Motion

Jul 5, 1687

Revolutionary War Begins

Apr 19, 1775

French REvolution Begins

Nov 1, 1775

Antione Lavosier Discover Law of Conservation of Mass

Jan 1, 1777

• no specific date
• matter no created/destroyed "Father of Mordern Chemistry"

John Dalton create his Atomic Theory

Jan 1, 1803

• no specific date found
• postulates: all matter composed of small particles "atoms," all atoms of elements identical (same size, mass, chemical properties), atoms in different elemtents different, atoms are not created but can be divided smaller and destroyed. atoms combine in whole number rations to make compounds
• Model = solid ball
• 3 Atomic Laws
• Law of Conservation of Mass, Law of Constant COmposition, Law of Multiple Porportions

Us Civil War Begins

Apr 12, 1861

First Telephone - Alexander Graham Bell

Aug 10, 1876

JJ Thompson Discovers Electrons

Jan 1, 1897

• no specific date
• discover electrons
• cathode ray tube
• Plum Pudding Model - charged shere with negative charged electron scattered inside

Wright Borther's First Flight

Dec 17, 1903

Rutherford Discover Elcetrons and Protons

Jan 1, 1911

• no specific date
• using Gold Foil Experiment
• positive charged nucleus
• nucleus almost all mass and small
• negative eectron occupy most volume
• atom mostly empty space
• Planetary Model

Bohr Disprove Planetary Model

Jan 1, 1913

• no specific date
• disprove planetary model
• interaction light and energy

WWI Begin

Jul 28, 1914

Russian Revolution Begins

Oct 13, 1917

James Chadwick Discover Nuetron

Jan 1, 1932

• no specific date
• electron cloud

WWII

Sep 1, 1939

Lunar Landing by Neal Armstrong

Jul 10, 1961