Slaney.Camara.atomictimeline

Ancient Times- Abu Ali al-Hasan ibn al-Hasan ibn al-Haytham eleventh-century Muslim scholar who developed the scientific method--the system of inquiry that uses experiments to test hypotheses.

Born in Basra (located in what is now Iraq) in 965, Ibn al-Haytham—known in the West as Alhazen or Alhacen—wrote more than 200 books and treatises on a wide range of subjects. He was the first person to apply algebra to geometry, founding the branch mathematics known as analytic geometry. Democritus: 460- 371



Democritus layed the basic idea of chemistry, his work took place in the 5th century. He stated that all things were made up of atom. Democritus research was well befre his time. He also had some understanding of the conservation of matter that states matter cannot be created or destroyed. This was again increadibly advanced.

Neils Bohr: 1885-1962



Neils Bohr was born on October 17th 1885 and died on November 18th 1962. He was born in Copenhagen, Denmark. His major contribution to the science communitry was understanding the structure of the Atom. Bohr used works from Rutherford. His understanding was thet electrons moved in orbit around a nucleus. He also believed in certain electron shells could hold differnet amounts of electrons increasing from the inner to the outer shell. An example of his revolutionary idea is pictured below.

James Chadwick 1891-1974



James Chadwick major contribution provided was the existance of neutrons. He colaberated with Ernest Rutherford another well respected scientist of his time. The importance of electrons was not fully understood as the basic building blocks of our world. He won the Nobel Proze in 1935. Chadwick also reserched nuclear fission which helped with the development ofthe nuclear weapons.

Marie Curie: 1867-1934



Marie Curie's research was focused on polominum and radium. She had to obtian these radioactivity elements from removing them from pitch blend. There less than 5% of these elements in the pitch blend in small pieces. He husband and herslef were forced to pick these small elements from a large amount of ptch blend. Her research was to try and use radioactivity to cure sickness. She eventually died as a result of her reserch.

John Dalton: 1766 1844



John Dalton is most famous for introducing "Dalton's Theory" which stated that all matter was composed of small indivisible particles, and that stoms of an elemnt posses unique characteristics and weight and that three types exist which are the following: elements, compund, and complex. He layed the path fot scientists who followed him to be sucessful. Werner Heisenberg: 1901-1976



Werner Heisenberg published his Nobel Prize winning work in quantum mechanics in 1925, when he was only 23 years old. His theory and other life work helped in the eventual discovery of “allotropic forms of hydrogen.” He was a pioneer in Physics and was awarded his Nobel Prize in 1932.


 * Wilhelm Rontgen: 1845-1923 **




 * Wilhelm Rontgen helped further the medical field by his discovery of x-rays. Though he was not the first to use x-rays, he was the first to witness an emission of an electric current flowing through gas. He observes an emission of light of the x-ray in a dark room. **
 * Robert Millikan 1868-1953 **


 * Robert Millikan’s contribution of the science community was his research on the polarization of light emission. Using an oil drop system experiment he was able to discover the charge of an electrons. This was alone of the most important discoveries to chemistry. **
 * Henri Becquerel: 1852-1908 **




 * Henri Becquerel’s claim to fame was his work in chemistry. He was left uranium slats from his late father and was able to prove natural radiation. He was also able to understand the difference between this natural radiation and x rays. He theorized that uranium caused gases to ionize and could be detected by electric fields. **
 * Ernest Rutherford:1871-1937 **

Ernest Rutherford primary work involved with magnetism and a little with radiation, specifically with alpha rays. He made a serious forward progress with these field but never made a ground breaking discovery.


 * Erwin Schrodinger: 1887-1961 **




 * Erwin Schrodinger did the majority of his work in quantum mechanics specifically in waves. He discovered that frequencies and wavelengths when placed in an equation could yield energy. **
 * JJ Thompson: 1856-1940 **




 * Sir JJ Thompson worked with electricity and magnetism. He won the Nobel Prize in 1906, and in 1906 was knighted. He came to the United States and gave a number of lectures. His research yielded the discovers of an electron with cathode rays. **

Edward Teller, January 15, 1908-September 9, 2003 Invetor of one of the worlds first atomic bombs and developed the first fusion bomb.

The Plum Pudding model was the model of J.J. Thompson in 1897. The model showed that an atom have both a positive and negative charge to it. The negative charge was in the form of negatively charged particles while the positive charge portion of the atom was thought to be its nucleus. The nucleus was a larger positively charged sphere with negatively charged particles placed inside it, thus it resembled plum pudding.

The Rutherford-Bohr model was by Niels Bohr and it was based of the experiments executed by Ernest Rutherford. The model shows a positive nucleus and negative electrons,This model shows the movement of an electron going from and outer shell to an inner shell the result of that is a show of color.

The Planetary model is used for atomic energy. This model shows all the parts of the atom, the nucleus and the electrons. In this model the color difference between the red and green dots are both the neutrons and the protons. The planetary model was given it’s name because the fact that the model is similar to that of the our solar system. The nucleus being the sun and the electrons being the planets.

The Electric cloud model was by Erwin Schrödinger built upon the thoughts of Bohr. Using the knowledge of Bohr’s experiment Erwin made a model that gave the probability of where the electrons have been and where they may be going. The flashing red dot represents the instances of an electron. The locations of where the electrons maybe quickly starts to look similar to that of a cloud because there are so many possible locations.