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480 BCE
Democritus
First person to propose that matter is made up of tiny particles -
340 BCE
Aristotle
believed that all substances were made of Fire, Water, Air, and Earth -
The American Revolution
The American Revolution started as a response to the Stamp Act of 1765. http://www.history.com/topics/american-revolution/american-revolution-history/videos -
Declaration of Independence
Benjamin Franklin, John Adams, Thomas Jefferson, Roger Sherman and Robert Livingston drafted the Declaration of Independence. -
Antonie Lavosier
found that mass is conserved in a chemical reaction and the number of hydrogen and oxygen atoms before and after the reaction remains the same. -
Joseph Proust
published his Law of Definite Proportions -
John Dalton
Created the theory of the atom stating that all matter is made of atoms and atoms are indivisible and indestructible.All atoms of a given element are identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. And a chemical reaction is a rearrangement of atoms. -
Amadeo Avagadro
hypothesised that equal volumes of different gases contain an equal number of molecules, given that they are at the same temperature and pressure -
The Battle of the Alamo
The Battle of the Alamo was a battle for an area of Texas http://www.history.com/topics/alamo/videos -
The American Civil War
The Civil War broke out for several reasons. one of the most important issues was slavery. -
Abraham Lincoln Assassination
Abraham Lincoln was assassinated at Ford’s Theatre by John Wilkes Booth. http://www.history.com/topics/us-presidents/abraham-lincoln/videos/the-other-side-of-lincoln-lincolns-assassination -
Madame Curie
discovered polonium and radium and X-rays -
William Crookes
Discovered the element thallium and the electron -
Henri Becquerel
discovered radioactivity -
J.J. Thomson
produced a series of experiments designed to study the nature of electric discharge in a high-vacuum -
Albert Einstein
came up with the law of conservation of mass and energy -
Ernest Rutherford
proved that radioactivity involved the nuclear transmutation of one chemical element to another and discovered the concept of radioactive half life -
Henry Moseley
proved that every element’s identity is uniquely determined by the number of protons it has -
Niels Bohr
Bohr developed a model of the atom which electrons revolve around the nucleus but can jump from energy level to energy level -
Max Planck
the originator of the quantum theory -
Womens Rights
women were granted the right to vote with the addition of the Nineteenth Amendment to the Constitution -
Robert Millikan
took a measurement of the elementary electronic charge -
Louis deBroglie
developed a theory on electron waves, predicted the wave nature of electrons. -
Werner Heisenberg
added to the atomic theory by including quantum mechanics based on quantum theory for interpretating behavior of elementary particles -
James Chadwick
Discovered the neutron -
Erwin Schrodinger
created the quantum mechanical model of the atom, an addon to Bohr's modle which uses an equasion to determine the position of electron -
D-Day
D-Day occurred, this was a major victory for Allied troops in World War II http://www.history.com/topics/world-war-ii/d-day/videos/dday-invasion -
Korean War
Korean War started, It was a war between the Democratic People’s Republic of Korea and the Republic of Korea. https://www.youtube.com/watch?v=t44SbOyjEUM -
The Vietnam War
The Vietnam War started, the conflict was between North Vietnam and South Vietnam https://www.youtube.com/watch?v=89_3DgW_7mg -
Moon
Apollo 11 was the first manned spacecraft to land on the moon. Buzz Aldrin and Neil Armstrong took the first steps on the moon
