The history of the atom by Omar Nicham https://padlet.com/omarnicham/yr7qni090wfcaqcw Everything is made of atoms. They are really small particles. en-us 2023-02-10 11:23:39 UTC 2023-02-14 09:58:17 UTC hello@padlet.com https://padlet.net/icons/png/1f1f2-1f1e6.png DEMOCRITUS (440 BC) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481328687

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 09:35:00 UTC https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481328687 JOHN DALTON (1803) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481345926

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 09:39:33 UTC https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481345926 JJ THOMSON (1897) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481349876

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


]]> 2023-02-14 09:40:34 UTC https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481349876 ERNEST RUTHERFORD (1909-1911) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481356963

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 09:42:23 UTC https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481356963 NIELS BOHR (1913) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481362830

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 
]]> 2023-02-14 09:44:00 UTC https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481362830 SCHRODINGER AND HEISENBERG (1926) omarnicham https://padlet.com/omarnicham/yr7qni090wfcaqcw/wish/2481366864

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


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