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Beginning of the Civil War
The Northern slave-free states fought against the southern pro-slave confederate states. The Northern states wanted slaves to be free in the United States. The confederate states wanted slaves in the United States. -
Gettysburg Address
This speech was given by Abraham Lincoln after the battle of Gettysburg. He gave the speech in Gettysburg, Pennsylvania to remember the fallen Union soldiers. -
Law of Octaves
The Law of Octaves was created by an English chemist called J. A. R. The law explains how to arrange Chemicals by atomic weight in intervals of 7. -
President Lincoln Assassinated
President Lincoln was at Ford’s theater watching the play, “Our American Cousin”. John Wilkes Booth shot him in the back of the head and he died the next day from his wound. -
Andrew Johnson impeached
President Andrew Johnson was impeached because he fired his secretary of war Edwin M. Stanton. -
Mendeleev’s Periodic Table
Dimitri Mendeleev was a Russian chemist that made a periodic table by sorting the elements by atomic mass. -
Discovery of the Proton
Eugen Goldstein discovered the proton. He also discovered that a proton is one unit of positive charge. However, he did not really call it a proton. -
Beginning of the Spanish American War
On April 25, 1898 Spain declared war on the United States after the battleship Maine was sunk in Havana Harbor in February 1898. -
Plum Pudding Model
The Plum Pudding Model was created by English physicist J. J. Thomson and portrays electrons suspended in a positively charged area. -
Great San Francisco Earthquake
On April 18, and earthquake of 7.8 magnitude and an intensity of 11 hit San Francisco. It was one of the most significant earthquakes of all time. -
Discovery of the Electron
The electron was discovered by J. J. Thomson with the cathode Ray experiment. Robert Millikan discovered that the electron is 1/1840 of a hydrogen atom. Also, an electron is one unit of negative charge. -
Rutherford’s Gold foil Experiment
Ernest Rutherford found that the atom is positively charged and has a nucleus with his Gold Foil experiment. Also known as the Geiger-Marsden Experiment. -
Titanic Disaster
On April 14, 1912, the RMS Titanic hit an iceberg on its maiden voyage from Southampton, England to New York. The Titanic did not have enough life boats and 1,500 people died. Only three dogs survived the disaster. link text -
Moseley/ Atomic Numbers
Moseley Discovered the number of protons in an atom is the atomic number of that element. -
Bohr’s Planetary Model of the Atom
Bohr discovered that the nucleus of an atom is surrounded by electrons orbiting like planets around the sun in the solar system. -
World War I
World War I started on July 28, 1914 in Europe. It was the Allies (Russian Empire, UK, Ireland) vs. the central powers of Germany and Austria-Hungary. In 1917 the United States joined the Allies. The war ended on November 11, 1918 after Germany signed an armistice. -
Schrodinger Equation
Schrödinger was an Austrian physicist. His equation uses light and matter to figure out waves of energy. -
Great Depression
The Great Depression started on October 29, 1929 after the US Stockmarket crashed. It caused drastic declines in outputs, bad unemployment, and deflation in almost every country. The Great Depression ended in 1939. -
Discovery of the Neutron
English Physicist, James Chadwick discovered that there was a neutral charge in the nucleus of the atom to go along with the protons. -
Beginning of World War II
Started September 1, 1939 after Nazi Germany invaded Poland. Afterwards France and the United Kingdom declared war on Germany.
