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Atomic Model - A Timeline

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Torri Haulcy

on 10 October 2012

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Transcript of Atomic Model - A Timeline

Atomic Theory Timeline By Torri Haulcy 460B.C.-370B.C. Democritus First suggested the existence of atoms
Believed atoms were invisible and indestructible
Thought they were always moving and combined with each other and that they were small, hard particles 1799 John Dalton Developed first atomic theory
Believed atoms were tiny, indestructible, invisible particles
Each one had a certain mass, size and chemical behavior Dalton's Model was called the Billard Ball Model. His theory was that all mater is made of atoms, all atoms are invisible and indestructible and given a element identical in mass and properties. He also thought that compunds form two or more different atoms and that a chemical reaction is a rearrangement of atoms. Dalton's Model
Billiard Ball Model 1897 JJ. Thompson Discovered Electron using Carthod Ray Tube
Proved atoms were divisible
Showed that Hydrogen has one electron Thompson's model was called the Plum Pudding Model. It was a sphere of positivley matter with negatively charged electrons surrounding the cloud. The Cathod Ray Tube Experiment The Plum Pudding Model 1911 Conducted the Gold Foil Experiment with his students
Discovered and named Alpha particles
Confirmed that atoms were mostly empty
Proved that all atoms had tiny positively charged center. Rutherford The Gold Foil Experiment The Planetary Model Rutherford's Model was called the Planetary Model. His theory was that the whole mass of atom concentrated in center of atom called nucleus, and that electrons were tiny, but dense elements. He also stated that the size of nucleus was small compared to the size of atom. 1913 Niels Bohr As a student of Rutherford, he questioned his theory.
Bohr's theory was that electrons orbit the positively charged nucleus with a set size and energy, with lowest energy found in smallest orbit. He also found that when electrons jump from one orbit to a inner one it omits light and radiation. His model is still used today. Bohr Model 460B.C.-1898 The Timeline of the Atomic Theory 460B.C.-370B.C. -Democritus, first to suggest existence of atoms
1650-Robert Boyle, concluded that gases are made of tiny particles that group together
1704-Issac Newton, proposed mechanical universe with small solid masses
1778 and 1783- Antoine Lavasier, discovered oxygen and hydrogen
1799-John Dalton, developed first atomic theory
1808- Joseph Gay-Lussac, discovered Boron, set Law of Combining Volume 1832- Micheal Faraday, Developed "electrolysis", the spiliting of molecules with electricity
1859- J. Pucker, built first CRT, used for x-rays
1869- Dmitri Mendeleev, discovered that properties of elements were periodic functions of the atomic weight, called Periodic Law
1873- James Clerk Maxwell, proposed that electric and magnetic fields filled the voids.
1894- G.J. Stoney, proposed the electricity was made of negative particles he called electrons
1898- Marie Curie, coined the term "Radioactivity" by studying the decaying process of Uranium and Thorium. 1900-present Atomic Model Theory Timeline(continued) 1990-Soddy, discovered half-life and observed disentegration of radioactive elements into variations called isotopes
1903-Nagaoka, built Saturanian model of atom
1905-Albert Einstein published the famous E=MC^2
1909-Robert Andrew Millikan, determined unit charge of electron with oil drop experiment 1.60x10^-14 and mass 9.11x10^-28g
1911-Rutherford, discovered Alpha particles
1913- Niels Bohr, created atomic model still used today
1914-H.C.J Moseley, wrote atomic numbers of elements are equal to number of protons in nucleus.
1919-Aston, discovered exsistence of isotopes with mass spectrograph
1923-de Brogile, discovered electrons had a dual nature similar to particles and waves
1926-Schrodinger, identified electron cloud as probable location of moving particles, known as Electron Cloud theory
1927-Heisenberg, proved you can not know the position and velocity at the same time, Principal of Indeterminacy
1932-Cockcroft/Walton, created first nuclear reaction
1932-Chadwick, discovered Nuetron
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