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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

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. 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 .

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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

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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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