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Unveiling the Atom: A Journey through History

Explore the evolution of atomic theory, from Democritus in 400 B.C. to modern models by Dalton, Thompson, Rutherford, and Bohr. Learn about atomic structures and elements composition. Study wave mechanics and electron behavior with temperature and volume changes.

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Unveiling the Atom: A Journey through History

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  1. D e v e l o p i n g o u r m o d e l o f a n a t o m

  2. D e m o c r i t u s • A G r e e k p h i l o s o p h e r i n t h e y e a r 4 0 0 B C . • H e u s e d t h e w o r d A t o m o s t o d e s c r i b e t h e s m a l l e s t p o s s i b l e p i e c e o f m a t t e r .

  3. J o h n D a l t o n P r o p o s e d t h e f i r s t a t o m i c t h e o r y i n 1 8 0 3

  4. D a l t o n ‘ s T h e o r y • A l l e l e m e n t s a r e c o m p o s e d o f i n d i v i s i b l e p a r t i c l e s . • A t o m s o f t h e s a m e e l e m e n t a r e t h e s a m e . • A t o m s o f d i f f e r e n t e l e m e n t s a r e d i f f e r e n t . • C o m p o u n d s a r e f o r m e d b y j o i n i n g a t o m s o f t w o o r m o r e e l e m e n t s .

  5. J. J. T h o m p s o n T h e E n g l i s h s c i e n t i s t w h o d i s c o v e r e d e l e c t r o n s i n 1 8 9 7 .

  6. E r n e s t R u t h e r f o r d T h e B r i t i s h p h y s i c i s t w h o, i n 1 9 0 8, p r o v e d t h e a t o m h a d a s m a l l, d e n s e, p o s i t i v e l y c h a r g e d n u c l e u s .

  7. N i e l s B o h r T h e D a n i s h s c i e n t i s t w h o , i n 1 9 1 3 , p r o p o s e d t h e p l a n e t a r y m o d e l o f t h e a t o m .

  8. B o h r ‘ s M o d e l

  9. T h e W a v e M o d e l • B a s e d o n w a v e m e c h a n i c s • E l e c t r o n s t r a v e l i n n o d e f i n i t e p a t h . • T h e p r o b a b l e l o c a t i o n o f a n e l e c t r o n i s b a s e d o n h o w m u c h e n e r g y t h e e l e c t r o n h a s .

  10. Temp ( oC ) 100 80 60 40 30 20 10 0 Volume ( ml ) 317 297 288 278 252 243 236 233

  11. A t o m M o d e l E n d

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