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362
Aristotle
In 362 B.C. Aristotle believed that no matter how many times you cut a form of matter in half there would always be a smaller piece of matter remaining. -
440
Democritus
In 440B.C. Democritus was the first person to ever come up with the theory of tiny particles that made up our universe. Even though Democrtus never performed any experiments and he had very little hard evidence he made one of the earliest discoveries of what are now called atoms. His models looked like different shapes, such as spheres, squares, and iron spikes. -
Joseph Proust
Proust proposed the Law of Constant Composition. It stated that a sample of a pure compound always contain the same elements in the same proportion. The samples are also always the same no matter how they were formed or where they were formed. -
John Dalton
Dalton's theory stated that the atoms of different elements could be distinguished by the differences in their weight. Dalton's Theory
1. All matter is composed of atoms
2. Atoms cannot be made or destroyed
3. All atoms of the same element are identical
4. Different elements have different types of atoms
5. Chemical reactions occur when atoms are rearranged
6. Compounds are formed from atoms of the basic elements. -
First camera
Alexander Walcott invented the camera, it was patented May 8, 1840. -
First Major League Baseball Game
The first MLB game was between the Cleveland Forest Cities and Ft. Wayne Kekiongas on May 4, 1871 -
First Beauty Pagent
One of the main beauty pagents occured in the summer of 1888. Newspapers were riddled with anouncements claiming to have picked the most beautiful women in the world. -
J.J. Thomson
In 1897 J.J. Thomson first dicovered the electron, and suggested that there were 1000's of electrons in every atom in-order to account for the mass. However in 1906 he came to the conclusion that there must be something balancing out the negative charge of the electrons. Thomson then came up with the plum pudding model suggesting that there were both positive and negative charged particles filling a sphere one ten billionth of a metre across. -
Max Planck
He gave life to the idea of the Quantum Theory and developed the Planck constant. The Planck constant can be used to discover the energy of a proton. He also wrote the Law of Heat radiation, this would then later lead Einstein and Bohr to the Quantum Theory. -
Henri Becquerel
Becquerel discovered that uranium spontaneously emits radiation. Becquerel placed a small sample of uranium and black paper into a paper bag nd mistakenly happened /to discover that the black paper was being exposed to radiation. -
Robert Millikan
Milikan discovered the unit charge of an electron to be 1.60x10^-19. The charge then is used to calculate the mass of an element. -
Ernest Rutherford
Rutherford was the first to split an atom and discovered that uranium could be used to tell the age of different things. By using the decay rate of uranium and telling how much of it was left in the sample the relative age could then be told. He also came up with the proposal that Alpa and Beta rays come off radioactive materials. Rutherfords most known accomplishments were the discovery of the nucleus and proposal of the Nuclear Model (Rutherford Model). -
Neils Bohr
Bohr continued to work on the findings of the atom. H believed that the electrons arbit around an atoms nucleus. Bohr also helped to explain that electrons emit and absorb energy. The Bohr Model includes shells that show electrons and the orbitals. -
WW1
WW1 was a massive war that involved all of the power houses in the world. Massacre and blood swept the nations as on country invaded another. -
Werner Heisenberg
Werner Heisenberg created what we now know as the Quantum Mechanical Model. His theory states that there is no deffinate location to the electrons inside the atom. There are only a few specific variables that are known. However these few variables can give us a 90% probability that the electron is located within a certain area. -
Erwin Schrodinger
Eriwn Schrodinger produced the equation that is now known as the Schrodinger equation. He took the ideas developed by de Broglie, Heisenberg and others and put them together in one equation. When solved the equation can predict the properties and reactivities of all atoms and molecules. He alsp stated that there are subshells inside of every shell of the atom -
Louis de Broglie
De Brogile's theory stated that the both light and matter travel in waves. He also said that electrons travel in an ordital called a shell. -
First Piece of Dubble Bubble Gum
Walter Diemer dubble bubble gum was so successful that it sold over a million and a half dollars worth of gum in the first year. . -
Invention of the Chocolate chip cookie!
In 1930 Ruth Wakefield was mixing a batch of cookies for her guests when she realized that she was out of baker's chocolate. She used broken pieces of Nestle's semi-sweet chocolate, expecting it would absorb into the cookie creating a chocolate flavored treat but instead led to the creation of the chocolate chip cookie. -
James Chadwick
Chadwick proved that the nucleus contained a neutral particle. With this creation nuclear weapons and the production of nuclear power were created. -
The First Computer
The Z1 originally created by Germany's Konrad Zuse in his parents living room in 1936 to 1938 is considered to be the first electrical binary programmable computer. -
First Post it Note
In 1968 an odd type of adhesive was discovered. Not until 1974 was this adhesive put to the use for a post it note. -
OUR GENERATION IS BORN
1993 marked the year in which adults first come to know our kind! Modern day teenagers (o_O) -
Present Day
It's today. October 3-4, 2010. Best known as the days in which procrastinators did this timeline. Thank you for reading this presentation Sincerely,
Brandon Storm and Madison Lewis
