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Development of the modern atomic theory. By Tricia Caldwell Period 4. 1803-1911. 1803- J. Dalton pictures atoms as tiny, indestructible particles, with no internal structure. 1897- J.J Thomson discovered the electron; pictures electrons embedded in a sphere of positive electrical charge
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Development of the modern atomic theory By Tricia Caldwell Period 4
1803-1911 • 1803- J. Dalton pictures atoms as tiny, indestructible particles, with no internal structure. • 1897- J.J Thomson discovered the electron; pictures electrons embedded in a sphere of positive electrical charge • 1904- H. Nagaoka suggested an atom has a central nucleus. Electrons orbit around the nucleus • 1911- E. Rutherford found that an atom has a small, dense, positively charged nucleus; electrons more around it. electron nucleus electron electrons nucleus
1913-1932 • 1913- N. Bohr modeled that the electron moves in a circular orbit at fixed distance from the nucleus • 1923- L.d. Broglie proposes that moving particles like electrons have some properties of waves • 1926- E. Schrodinger develops mathamatical equations to describe moving electrons • 1932- J. Chadwick confirms existance of neutrons that have no charge and is in atomic nucluei nucleus electron
Works Cited • http://www.google.com/imgres?imgurl=http://physics.weber.edu/carroll/wonder/images/stm.gif&imgrefurl=http://physics.weber.edu/carroll/wonder/electron_waves.htm&usg=__jF8D3jGw5eYUaTYeMzLgtdOVK4Y=&h=429&w=600&sz=106&hl=en&start=0&zoom=1&tbnid=zl3tFguEPnIXvM:&tbnh=128&tbnw=179&prev=/images%3Fq%3Delectrons%2Bwaves%26hl%3Den%26biw%3D1020%26bih%3D567%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=hc&vpx=226&vpy=77&dur=1750&hovh=190&hovw=266&tx=171&ty=91&ei=emmSTMfDBYb0swPyy_jACg&oei=emmSTMfDBYb0swPyy_jACg&esq=1&page=1&ndsp=15&ved=1t:429,r:1,s:0 • http://www.google.com/imgres?imgurl=http://www.losgazquez.com/blog/wp-content/uploads/2007/12/electrons.jpg&imgrefurl=http://www.losgazquez.com/blog/%3Fm%3D200712&usg=__Xw3r4z65VZRbePdb8vzcMpCn-64=&h=305&w=300&sz=120&hl=en&start=0&zoom=1&tbnid=zTWGBFhvh-OVvM:&tbnh=126&tbnw=122&prev=/images%3Fq%3Delectrons%26hl%3Den%26biw%3D1020%26bih%3D567%26gbv%3D2%26tbs%3Disch:10%2C162&itbs=1&iact=hc&vpx=754&vpy=203&dur=609&hovh=226&hovw=223&tx=165&ty=76&ei=NmqSTIftLYfUtQO5pOzACg&oei=FmSSTMSQD5DksQPBqITBCg&esq=3&page=1&ndsp=18&ved=1t:429,r:17,s:0&biw=1020&bih=567 • http://www.google.com/imgres?imgurl=http://www.nmsea.org/Curriculum/4_6/Electricity/wire_electrons.gif&imgrefurl=http://www.nmsea.org/Curriculum/4_6/Electricity/dc_electricity.htm&usg=__zWAyYogPusvIstmHXG1F94qz2qE=&h=360&w=480&sz=6&hl=en&start=18&zoom=1&tbnid=9NMlX4vTnmbFOM:&tbnh=122&tbnw=170&prev=/images%3Fq%3Delectrons%26hl%3Den%26biw%3D1020%26bih%3D567%26gbv%3D2%26tbs%3Disch:10%2C453&itbs=1&iact=hc&vpx=122&vpy=262&dur=1109&hovh=194&hovw=259&tx=158&ty=197&ei=YWqSTPjTEYu8sQPOnJzlCQ&oei=FmSSTMSQD5DksQPBqITBCg&esq=2&page=2&ndsp=15&ved=1t:429,r:10,s:18&biw=1020&bih=567 • http://www.google.com/imgres?imgurl=http://www.csmate.colostate.edu/cltw/cohortpages/viney_off/atom.jpg&imgrefurl=http://www.csmate.colostate.edu/cltw/cohortpages/viney_off/atomhistory.html&usg=__mwHkHcenVMtzyNMKGFFYH8q3JDM=&h=393&w=629&sz=16&hl=en&start=0&zoom=1&tbnid=WwmPTFhBUnffcM:&tbnh=126&tbnw=209&prev=/images%3Fq%3Delectron%2Bcloud%2Bmodel%2Bof%2Batom%26hl%3Den%26sa%3DX%26gbv%3D2%26biw%3D1003%26bih%3D567%26tbs%3Disch:1&itbs=1&iact=hc&vpx=129&vpy=115&dur=797&hovh=177&hovw=284&tx=99&ty=108&ei=U2uSTOcRi_iwA76O6OQJ&oei=U2uSTOcRi_iwA76O6OQJ&esq=1&page=1&ndsp=15&ved=1t:429,r:0,s:0 • Textbook pg 128-129
