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C.6A: Atomic Theory Atomic Structure and Nuclear Chemistry Part I: Vocabulary Matching Match the terms on the right to the correct definition. 1. _______ atomic theory A. Specific regions around the nucleus of an atom in which electrons travel 2. _______ electron orbital B. 3. _______ nucleus C. Conceptual model of the atom in which a small, positively-charged nucleus is surrounded by negatively-charged electrons 4. _______ nuclear atom Part II: Identification Dense, positively-charged region in the center of an atom D. Theory that all matter is composed of tiny indivisible particles known as atoms Use the clues provided to fill in the blanks. Word Bank Ernest Rutherford Niels Bohr J.J. Thomson John Dalton 1. _________________________ first described the atom as having a central positivelycharged nucleus surrounded by orbiting electrons. 2. In the late 1800s, ___________________ discovered electrons through his explorations on the properties of cathode rays. 3. In the early 1800s, the chemist who proposed the first theory relating chemical changes to events at the atomic level was __________________________. 4. ___________________ developed the modern model of an atom which expanded on Rutherford’s description by explaining that electrons travel only in certain successively larger orbits. 1 C.6A: Atomic Theory Atomic Structure and Nuclear Chemistry Part III: Open-Ended Response Answer the questions below. Use additional paper if needed. 1. Which statements in Dalton’s original atomic theory are now considered to be incorrect? Describe how modern atomic theory differs from these statements. ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ 2. Compare and contrast Thomson’s plum pudding atomic model with Rutherford’s nuclear atomic model, and state why the plum pudding model was deemed incorrect. _____________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ 2 C.6A: Atomic Theory Atomic Structure and Nuclear Chemistry Part IV: Graphic Organizer Using all of the following terms in the word bank, complete the timeline below. Word Bank Ernest Rutherford Niels Bohr J.J. Thomson Democritus John Dalton Historical Contributions to Modern Atomic Theory 470-375 BC 1.______________________ Believed matter was made of indivisible particles called atomos 1766 – 1844 2.________________________ English schoolteacher – Atomic Theory (postulates) 1856 – 1940 3.__________________________ Plum pudding model – cathode rays – discovery of the electron 1871 – 1937 4.__________________________ Gold foil experiment – nuclear atom 1885 – 1962 5.__________________________ Quantum model - electrons of Hydrogen exist only in specific energy levels 3