The history of the atom by Aunitz Zaldua Gogortza https://padlet.com/aunitzaldua/1gbdkslovfd5mctv A atom is small en-us 2023-02-14 11:07:26 UTC 2023-02-15 09:38:36 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS 440 BC aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483185930 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”. 


]]> 2023-02-15 09:07:09 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483185930 JOHN DALTON (1803) aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483187256 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 09:08:33 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483187256 JJ THOMSON (1897) aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483195617

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


]]> 2023-02-15 09:16:42 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483195617 ERNEST RUTHERFORD (1909-1911) aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483196937

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 09:18:05 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483196937 NIELS BOHR (1913) aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483198951

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


]]> 2023-02-15 09:20:04 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483198951 SCHRODINGER AND HEISENBERG (1926) aunitzaldua https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483200452

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


]]> 2023-02-15 09:21:29 UTC https://padlet.com/aunitzaldua/1gbdkslovfd5mctv/wish/2483200452