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Atomic Structure Timeline
Transcript of Atomic Structure Timeline
Timeline Atom Democritus of Abdera Aristotle Joseph John Thomson Robert Millikan Max Planck Basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. ~400 B.C. (5th century B.C.) mid 300’s BC 1803, 1805, 1808 1897 1897 1900 Proposed that matter was composed of tiny indivisible particles
atomic theory posited that all matter is made up small indestructible units he called atoms. He developed the theory that all matter consisted of four elements: Earth, Air, Water and Fire. John Dalton Proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together. indivisible, solid sphere Indivisible- the Greek word for ‘uncuttable’).
Its eternal homogeneous and identical in substance. The atoms are in different shape and have different behaviors too. The atom exists as the smallest particle of matter was undisputed by Aristotle. Solid Sphere Discovered Electron's negative particles within the atom Plum-pudding Model. PlumPlum (raisin) pudding model The mass equals to the mass of neutron. The center is the nucleus, and it contains most of the mass of an atom. The nucleus is composed of positively charged protons and neutrons which are neutral in charge. Negatively charged electrons orbit the nucleus at a great distance compared to the size of the nucleus. Millikan conducted the Oil Drop Experiment
He determined the charge on electrons OIl Drop Experiment Proposed the idea of quantization to explain how a hot, glowing object emitted light Ernest Rutherford 1911, 1915, 1918 -Gold Foil Experiment,Discovered the nucleus
dense, positive charge in the center of the atom.
Niels Bohr 1912 -Planetary Model
-Electrons move in circular orbits within specific energy levels Quantum mechanical model of ATOM The electron travels in a circular motion in this model. And the energy is emitted from the atom when electron goes from one orbit to another and gets closer to nucleus. Louis deBroglie 1924 Proposed that electrons have a wave/particle duality.
Erwin Schrödinger 1926 -Quantum mechanics electrons can only exist in specified energy states
-Electron Cloud Model (orbital)dots represent probability of finding an e- not actual electrons Werner Heisenberg 1927 Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle. James Chadwick 1932 He discovered neutrons, particles
whose mass was close to that of a proton. Nuclear Model THE END Amy Chen
1/8/13 Resources/ Sites http://craigjm.tripod.com/physics.html