THE HISTORY OF THE ATOMS by Keila Tay De la Gala https://padlet.com/keilatay/1a4tnunqdpmlav22 Everything is made of ATOMS en-us 2023-02-14 11:06:52 UTC 2023-02-22 09:36:04 UTC hello@padlet.com https://padlet.net/icons/png/1f9ec.png DEMOCRITUS (440 BC) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2481619010 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”. 

He had an idea of an atom, meaning a piece of matter that was not able to be divided. 


]]> 2023-02-14 11:27:37 UTC https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2481619010 JOHN DALTON (1803) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483186604 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 09:07:51 UTC https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483186604 JJ THOMSON (1897) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483189519 He discovered negatively charged particles inside the atom (electrons). ]]> 2023-02-15 09:10:44 UTC https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483189519 ERNEST RUTHERFORD (1909-1911) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483199767 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 09:20:50 UTC https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483199767 NIELS BOHR (1913) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483201046 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-15 09:21:56 UTC https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483201046 SCHRODINGER AND HEISENBERG (1926) keilatay https://padlet.com/keilatay/1a4tnunqdpmlav22/wish/2483202670 He proposed that electrons do not travel in definite paths around the nucleus.


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