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Name __________________________________________________________ Date ___________ Period ________ Atomic Structure Timeline Notes 400 B.C. ___________________________________ Proposed that ___________________ was composed of tiny indivisible particles called _____________________. 1807 _____________________________ _________________________________ A British schoolteacher who based his theory on others experiment. Scientist used the __________________________ __________________ __________________ and discovered that the atom was a _____________________________, solid ________________________. Dalton’s Four Postulate 1. Elements are composed of small indivisible particles called __________________. 2. Atoms of the same element are __________________________. Atoms of different elements are ________________________________. 3. Atoms of different elements combine together in simple proportions to create a ______________________________________. 4. In a chemical reaction, atoms are __________________________, but not ______________________________________. 1896 ______________________________ ____________________________ Discovered radioactivity by spontaneous emission of radiation from the _______________________. He discovered that there were three types of emission ____________________, _________________________, _____________________ 1903 ____ ______ ______________________ Using the cathode ray tube experiment he used a beam to discover that there were negative particles. Therefore, discovering __________________________. Which are negatively charges particles with in the atom. He used the ____________________ ______________________ model to explain his discovery. Plum-pudding Model has a positive sphere (pudding) with _______________________ electrons (plums) dispersed throughout. 1911 ___________________________ ___________________________________ Using the Gold Foil experiment he discovered that the _________________________ had a dense, _____________________ charge in the center of the atom. He used the ____________________________ model to explain his discovery. 1913 _____________________________ ____________________________ Scientist used the bright-line spectrum to explain the presence of specific colors in the hydrogen spectrum. Based on the _______________________ ______________________ electrons can only exist in specific energy states. He used the ________________________ Model to explain his discovery. The Planetary Model showed how the electrons moved in circular orbits within specific energy levels. 1926 ______________________ _______________________________________ Scientist used Quantum mechanics to discover that the electrons can only exist in specific energy states. Using the _______________________ ______________________ model he used dots to represent the probability of finding electron (orbitals) not actual electrons. 1932 __________________________ _______________________________ Scientist discovered that the _________________________ was a neutral particle in the nucleus of an atom. Joliot-Curie used his experiment and based his theory on the evidence of James Chadwick. Chadwick revised Rutherford’s model and called his model the ___________________________ Model to explain his discovery.