ATOMIC THEORY TIMELINE by Sumaya Rahaman https://padlet.com/22004967_4/l25fink32xxc14k7 Sumaya Rahaman en-us 2021-03-23 22:29:52 UTC 2024-06-04 18:48:31 UTC hello@padlet.com https://emojipedia-us.s3.dualstack.us-west-1.amazonaws.com/thumbs/160/facebook/105/atom-symbol_269b.png John Dalton (1803) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345431309 πŸ“Œ  The Dalton model was created by John Dalton in 1803.
  • Atoms of one element are
    identical while atoms of different elements are different
  • Different atoms form compounds in constant ratios.
]]> 2021-03-23 22:40:57 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345431309 Ernest Rutherford (1909) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345434835 πŸ“Œ  The Rutherford model was created by Ernest Rutherford in 1909.
  • Positive charge is not like a pudding, but concentrated in the nucleus as shown in the Gold Foil (alpha particle experiment).
]]> 2021-03-23 22:43:01 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345434835 J.J Thomson (1897) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345437014 πŸ“Œ  The Thomson model was created by J.J Thomson in 1897.
  • Electrons are dispersed in a uniform positive charge.
]]> 2021-03-23 22:44:17 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345437014 Greek (400 B.C) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345437622 πŸ“Œ  The Greek model was created by Democritus in 400 B.C.  
  • All matter around us is made of indivisible tiny particles- β€œatomos”
]]> 2021-03-23 22:44:39 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345437622 Niels Bohr (1913) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345439466 πŸ“Œ  The Bohr model was created by Niels Bohr in 1913.
  • Electrons orbit the nucleus.
  • Energy of the electrons is quantized.
]]> 2021-03-23 22:45:39 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1345439466 Quantum Mechanical Model (1926) β†’ 22004967_4 https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1347741983 πŸ“Œ  The Quantum Mechanical Model was created by Erwin SchrΓΆdinger in 1926.
  • Electrons can act like particles and waves .
  • Electrons occupy orbitals. 
]]> 2021-03-24 13:10:55 UTC https://padlet.com/22004967_4/l25fink32xxc14k7/wish/1347741983