THE HISTORY OF THE ATOM by Julen Arozena Ucin https://padlet.com/julenau/31yzxr86hnikrei2 Everything is made of atom en-us 2023-02-08 11:18:11 UTC 2023-02-15 11:20:07 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS (440 BC) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2474755135
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”. 


]]> 2023-02-09 09:53:39 UTC https://padlet.com/julenau/31yzxr86hnikrei2/wish/2474755135 JOHN DALTON (1803) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2474764916
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).






]]> 2023-02-09 10:02:17 UTC https://padlet.com/julenau/31yzxr86hnikrei2/wish/2474764916 JJ THOMSON (1897) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481121257
He discovered negatively charged particles inside the atom (electrons). 



]]> 2023-02-14 08:28:20 UTC https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481121257 NIELS BOHR (1913) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481130703

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-14 08:38:09 UTC https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481130703 SCHRODINGER AND HEISENBERG (1926) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481131251
He proposed that electrons do not travel in definite paths around the nucleus.


]]> 2023-02-14 08:38:46 UTC https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481131251 ERNEST RUTHERFORD (1909-1911) julenau https://padlet.com/julenau/31yzxr86hnikrei2/wish/2481136934
He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


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