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Download Atomic Timeline There are small, negatively charged particles inside
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Atomic Timeline The table below contains a number of statements connected to major discoveries in the development of the atomic theory. 1. In each box, write the name of the scientist(s) associated with the statement. Choose from among the following scientists: Democritus --- 440 B.C. Thomson --- 1897 Bohr --- 1913 Rutherford --- 1911 Dalton --- 1803 Schrodinger and Heisenberg --- 20th century 2. On a separate sheet of paper, construct a timeline, and label the following: 440 B.C., 1803, 1897, 1911, 1913, and the 20th century. Cut out the boxes below, and glue each box of information at the correct point along your timeline. There are small, negatively charged particles inside an atom. Scientist ___________________ Year ______ There is a small, dense, positively charged nucleus. Scientist ___________________ Year ______ Most of an atom’s mass is in the nucleus. Scientist ___________________ Year ______ Electrons jump between levels from path to path. Electron paths cannot be predicted. Scientist __________________ Year _______ Electrons travel in definite paths. Scientist __________________ Year _______ Electrons move in empty space in the atom. Scientist ____________________ Year _____ He conducted the cathode-ray tube experiment. Scientist ____________________ Year _____ His theory of atomic structure led to the “plumpudding” model. Scientist ____________________ Year _____ Electrons are found in electron clouds, not paths. Scientist __________________Year _______ Atoms of different elements are different. Scientist ____________________ Year _____ Atoms of the same element are exactly alike. Scientist ____________________ Year _____ Atoms contain mostly empty space. Scientist ___________________ Year ______ Atoms constantly move. Scientist ____________________ Year _____ Atoms are small, hard particles. Scientist __________________ Year _______ All substances are made of atoms. Scientist ___________________ Year ______ He conducted experiments in combining elements. Scientist ___________________ Year ______ He conducted the gold foil experiment. Scientist ___________________ Year ______ Atoms are “uncuttable.” Scientist ___________________ Year ______ Elements combine in specific proportions. Scientist ___________________ Year ______ Scientist __________________ Year _______
