atomic structure2

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S.MORRIS 2006 More free powerpoints at www.worldofteaching.com This Powerpoint is hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints
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HISTORY OF THE ATOM HISTORY OF THE ATOM 460 BC De m o c ritus  de ve lo ps  the  ide a  o f a to m s he  po unde d up m a te ria ls  in his  pe s tle  a nd  m o rta r until he  ha d re duc e d the m  to  s m a lle r a nd  s m a lle r pa rtic le s  whic h he  c a lle d ATOMA ATOMA   (greek for indivisible)
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HISTORY OF THE ATOM HISTORY OF THE ATOM 1808 Jo hn Da lto n s ug g e s te d tha t a ll m a tte r wa s  m a de  up o f tiny  s phe re s  tha t we re  a b le  to  b o unc e  a ro und with  pe rfe c t e la s tic ity a nd c a lle d the m ATOMS ATOMS  
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HISTORY OF THE ATOM HISTORY OF THE ATOM 1898 Jo s e ph Jo hn Tho m ps o n fo und tha t a to m s  c o uld s o m e tim e s  e je c t a  fa r  s m a lle r ne g a tive  pa rtic le  whic h he  c a lle d a n ELECTRON ELECTRON  
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HISTORY OF THE ATOM Tho m ps o n de ve lo ps  the  ide a  tha t a n a to m  wa s  m a de  up o f e le c tro ns   s c a tte re d une ve nly within a n e la s tic  s phe re  s urro unde d b y a  s o up o f  po s itive  c ha rg e  to  b a la nc e  the  e le c tro n's  c ha rg e 1904 like  plum s  s urro unde d b y pudding . PLUM PUDDING
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