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Atomic Theory Project

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DeAndre Sutton

on 26 September 2017

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Transcript of Atomic Theory Project

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Atomic Theory Project: PhysicistTimeline

Ernest Rutherford
Born on August 30, 1871 in Brightwater, New Zealand
Died on October 19, 1937 in Cambridge, United Kingdom from a strangulated hernia
Known as the "Father of the Nuclear Age"
He was the fourth of 12 children, and the second son
In 1889 he was awarded a University scholarship and he proceeded to the University of New Zealand, Wellington, where he entered Canterbury College
He was awarded an 1851 Exhibition Science Scholarship, enabling him to go to Trinity College, Cambridge, as a research student at the Cavendish Laboratory under J.J. Thomson
JJ Thomson's work only explained some of the electrical properties of the atom due to electrons, but there was a lack of information of positive (protons) charges in the atom.
BY :De'Andre Sutton
JJ Thomson
Born in Cheetham Hill, a suburb of Manchester on December 18, 1856
Died on August 30 1940, Cambridge, United Kingdom
Enrolled at Owens College, Manchester, in 1870, and in 1876 entered Trinity College, Cambridge as a minor scholar
He was Cavendish Professor of Experimental Physics at Cambridge, where he succeeded Lord Rayleigh
Thomson's experimeted with cathode rays that led to the discovery of the electron in 1897, and he pursued further innovations in atomic structure exploration. He noticed that an atom can be divided, and they are made of positive cores and negatively charged particles within it.
Ernest Rutherford assumed the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay. Experiments done in Rutherford’s laboratory showed that when alpha particles are fired into gas atoms, a few are violently deflected, which implies a dense, positively charged central region containing most of the atomic mass. In 1911, Rutherford reversed Thomson's model with his well-known gold foil experiment in which he demonstrated that the atom has a tiny, heavy nucleus.
Niels Bohr
Born on October 7, 1885, in Copenhagen, Denmark
Died on November 18, 1962, Valby, Copenhagen, Denmark
He won the 1922 Nobel Prize in physics for his ideas and years later, after working on the Manhattan Project in the United States
Bohr eventually attended Copenhagen University, where he received his master's and doctorate in physics by 1911
He traveled to Cambridge, England, where he was able to follow the Cavendish Laboratory work of scientist JJ Thomson
Bohr received the 1922 Nobel Prize in Physics for his work on atomic structures
Bohr discovered the atom as a small, positively charged nucleus surrounded by orbiting electrons. He developed a model that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another.
A element is a substance that cannot be broken down into simpler substances by chemical means. An element is composed of atoms that have the same atomic number, that is, each atom has the same number of protons in its nucleus as all other atoms of that element.
Element
Atomic mass
Atomic mass is the mass of an atom of a chemical element expressed in atomic mass units. It is roughly equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Atomic Number
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table. it indicates the position of an element in the periodic table. The number of protons in the nucleus of an atom. In electrically neutral atoms, the number is also equal to the number of electrons orbiting about the atom's nucleus.
Isotope
any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights.
Ion

Ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons. When an atom loses or gains electrons, a positive or negative charge is the result. If electrons are gained, the ion is a cation and when electrons are lost, it is an anion
Protons contribute to the mass of an atom and provide positive charge to the atom. The number of protons also determines the identity of the element.
Comparing & Contrasting Protons, Electrons , and Neutrons


They are all subatomic particles which means they are located in the atom.The electron is located outside while the proton and neutron is located in the nucleus with 1 mass. Protons has +1, and electrons have -1 charge, and neutrons has no charge.Protons and electrons are the only two that has charge.
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