THE HISTORY OF THE ATOM by Camila Victoria Granados Rodriguez https://padlet.com/camilagranados2/dqrul484t9ixgmfw Everything is made of atoms en-us 2023-02-14 11:10:18 UTC 2023-02-15 09:40:59 UTC hello@padlet.com https://padlet.net/icons/png/1f9ec.png DEMOCRITUS (440 BC) camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2481601643

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 11:22:12 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2481601643 JOHN DALTON (1803) camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483189165 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).


]]> 2023-02-15 09:10:24 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483189165 JJ THOMSON (1897 camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483192434

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






]]> 2023-02-15 09:13:31 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483192434 ERNEST RUTHERFORD (1909-1911) camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483194314

He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 





]]> 2023-02-15 09:15:32 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483194314 NIELS BOHR (1913) camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483197575

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





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



]]> 2023-02-15 09:18:42 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483197575 SCHRODINGER AND HEISENBERG (1926) camilagranados2 https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483198632

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


]]> 2023-02-15 09:19:45 UTC https://padlet.com/camilagranados2/dqrul484t9ixgmfw/wish/2483198632