HISTORY OF THE ATOM by Peio Endemaño Ansola https://padlet.com/peioendemano/qb88qrufjdv1mkzr They are really small tiny particles.They are so small that we cannot see them with our eyes. en-us 2023-02-10 11:08:19 UTC 2023-02-14 09:50:25 UTC hello@padlet.com https://padlet.net/icons/png/1f1f9-1f1f7.png DEMOCRITUS (440 BC) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476286414 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”. 


]]> 2023-02-10 11:23:41 UTC https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476286414 JOHN DALTON (1803) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476287519 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).



]]> 2023-02-10 11:24:45 UTC https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476287519 JJ THOMSON (1897) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476289564 He discovered negatively charged particles inside the atom (electrons). 



]]> 2023-02-10 11:26:48 UTC https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476289564 ERNEST RUTHERFORD (1909-1911) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476290302 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 



]]> 2023-02-10 11:27:36 UTC https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476290302 NIELS BOHR (1913) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476290897 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 



]]> 2023-02-10 11:28:15 UTC https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476290897 SCHRODINGER AND HEISENBERG (1926) peioendemano https://padlet.com/peioendemano/qb88qrufjdv1mkzr/wish/2476291348 He proposed that electrons do not travel in definite paths around the nucleus.


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