THE HISTORY OF ATOM by Araitz Borda Larrañaga https://padlet.com/araitzborda/rjo5bkidhxfx2ckv Everything is made of atoms. They are really small (tiny) particles. They are so small that we cannot see them whit our eyes. Atoms are made up of three particles: protons neutrons and electrons en-us 2023-02-08 11:18:20 UTC 2023-02-14 09:04:40 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS(440 BC) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2474753438 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 09:52:08 UTC https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2474753438 JOHN DALTON (1803) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2474762440 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 10:00:08 UTC https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2474762440 JJ THOMSON (1897) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481125476

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


]]> 2023-02-14 08:32:42 UTC https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481125476 ERNEST RUTHERFORD (1909-1911) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481126548

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 08:33:44 UTC https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481126548 NIELS BOHR (1913) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481134028
He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 

]]> 2023-02-14 08:41:49 UTC https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481134028 SCHRODINGER AND HEISENBERG (1926) araitzborda https://padlet.com/araitzborda/rjo5bkidhxfx2ckv/wish/2481135149 He proposed that electrons do not travel in definite paths around the nucleus.


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