THE HISTORY OF THE ATOM by Laia Uribetxeberria Izagirre https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3 Everything is made of ATOMS. en-us 2023-02-14 11:06:10 UTC 2023-02-15 09:08:41 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS (440 BC) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481611057 He proposed that matter could not be divided into smaller pieces forever. He said that matter was made of small, hard particles that he called “atoms”. 


]]> 2023-02-14 11:25:22 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481611057 JOHN DALTON (1803) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481616370 He created the very first atomic theory. 
All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed. Atoms are invisible.
Atoms join together to make new substances (molecules).



]]> 2023-02-14 11:26:47 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481616370 JJ THOMSON (1897) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481620185 He discovered negatively charged particles inside the atom (electrons). 



]]> 2023-02-14 11:27:58 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481620185 ERNEST RUTHERFORD (1909-1911) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481625253 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


]]> 2023-02-14 11:29:34 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481625253 NIELS BOHR (1913) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481628489 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 



]]> 2023-02-14 11:30:35 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2481628489 SCHRODINGER AND HEISENBERG (1926) laiauribetxeberria https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2483187378 He proposed that electrons do not travel in definite paths around the nucleus.


]]> 2023-02-15 09:08:41 UTC https://padlet.com/laiauribetxeberria/gl719jxup9gic6n3/wish/2483187378