THE HISTORY OF THE ATOMS by Aratz Iturbe Arakistain https://padlet.com/aratziturbe/l5iw0isy0ajruilz Everything is made of atoms. en-us 2023-02-14 11:06:18 UTC 2025-11-02 02:00:14 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS (440 BC) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481595035

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 11:19:38 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481595035 JOHN DALTON (1803) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481596759

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 11:20:13 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481596759 JJ THOMSON (1897) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481600421

He discovered negatively charged particles inside the atom (electrons). 


]]> 2023-02-14 11:21:46 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481600421 ERNEST RUTHERFORD (1909-1911) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481607697
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 11:24:21 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481607697 NIELS BOHR (1913) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481613478

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 
]]> 2023-02-14 11:25:56 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481613478 SCHRODINGER AND HEISENBERG (1926) aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481615449

He proposed that electrons do not travel in definite paths around the nucleus.


]]> 2023-02-14 11:26:30 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2481615449 ATOMS aratziturbe https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2483186348 2023-02-15 09:07:36 UTC https://padlet.com/aratziturbe/l5iw0isy0ajruilz/wish/2483186348