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The U.S. Civil War, also called the War Between the States, was waged from April 1861 until April 1865. The war was precipitated by the secession of eleven Southern states during 1860 and 1861 and their formation of the Confederate States of America under President Jefferson Davis. The Southern states had feared that the new president, Abraham Lincoln, who had been elected in 1860, and Northern politicians would block the expansion of Slavery and endanger the existing slaveholding system. Though
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A three-minute address by Abraham Lincoln during the American Civil War at the dedication of a national cemetery on the site of the Battle of Gettysburg (November 19, 1863). Shortest speech given during that time period.
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On April 14, 1865, President Abraham Lincoln was assassinated at Ford's Theater in Washington, D.C. Five days earlier; Confederate General Robert E. Lee had surrendered to Union troops. John Wilkes Booth, a well-known actor, Confederate sympathizer, and spy, has gone down in history as the lone assailant of Lincoln.
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Proposed by J.A.R Newlands. It states that if chemical elements are arranged according to inreasing atomic weight, those with similar properties occur after each interval of 7 elements.
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The Impeachment of Andrew Johnson, 17th President of the United States, was one of the most dramatic events in the political life of the United States during Reconstruction, and the first impeachment in history of a sitting United States president. Johnson was impeached for his efforts to undermine Congressional policy; he was acquitted by one vote.
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Dmitri Mendeleev made the periodic table. He aarranged the elements in a table vertically by similar properties, and horizontal rows arranged by atomic radius, ionization energy, and electronegativity.
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J.J Thompson discovered the electron.
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A war between Spain and the United States in 1898, as a result of which Spain ceded Puerto Rico, the Philippine Islands, and Guam to the United States and abandoned all claim to Cuba, which became independent in 1902.
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JJ Thompson made a model of an atom. It is composed as an electron surrounded by positive charges to balance out the negative ones. He discovered the atom, but his model was later disproved in 1909
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The San Francisco earthquake of 1906 was a major earthquake that struck San Francisco and the coast of Northern California at 5:12 a.m. on Wednesday, April 18, 1906.[3] Devastating fires broke out in the city and lasted for several days. As a result of the quake and fires, about 3,000 people died[4] and over 80% of San Francisco was destroyed.
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Hans Geiger and Ernest Marsden (by sugguestion of Ernest Rutherford), proved the existence of a small, denser center to atoms, called the nucleus.
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RMS Titanic was the largest passenger steamship in the world when she set off on her maiden voyage from Southampton, England, to New York City, U.S.A., on 10 April 1912. Four days into the crossing, at 23:40 on 14 April 1912, she struck an iceberg and sank at 2:20 the following morning, resulting in the deaths of 1,517 people in one of the deadliest peacetime maritime disasters in history.
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Erwin Schrodinger made a fundamental equation for describing quantum mechanical behavior.
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Henry Moseley studied under Rutherford.He requested a more accurate positioning of elements in the Periodic Table by closer determination of atomic numbers. When atoms were arranged according to increasing atomic number, the few problems with Mendeleev's periodic table had disappeared. Because of his work, the modern periodic table is based on the atomic numbers of the elements.
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A war between the allies (Russia, France, British Empire, Italy, United States, Japan, Rumania, Serbia, Belgium, Greece, Portugal, Montenegro) and the Central Powers (Germany, Austria-Hungary, Turkey, Bulgaria) from 1914 to 1918.
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Neils Bohr made a model of the atom based on quantum mechanics (there are some errors). It describes most of the accepted features of atomic history without all of the high level math of the modern one. Explains the Rydberg formula. It is a planetary model in which negatively chared electrons orbit in a small positive charged nucleus similar to planets orbiting the sun.
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Discovered in 1918 by Ernet Rutherford, the sam man to prove the existence of a nucleus in an atom.
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An economic recession that began on October 29, 1929, following the crash of the U.S. stock market. The Great Depression originated in the United States, but quickly spread to Europe and the rest of the world. Lasting nearly a decade, the Depression caused massive levels of poverty, hunger, unemployment and political unrest.
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James Chadwick discovered the neutron in 1932.
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World War II, or the Second World War, was a global military conflict lasting from 1940 to 1945, which involved most of the world's nations, including all of the great powers: eventually forming two opposing military alliances, the Allies and the Axis.
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