History of the atoms by Mikel Soraluze Segurajauregi https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0 - They are really small (tiny) particles. They are so small that we cannot see them with our eyes. en-us 2023-02-10 10:58:30 UTC 2023-02-14 10:00:10 UTC hello@padlet.com https://padlet.net/icons/png/1f52c.png DEMOCRITUS (440 BC) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476271901

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. 


]]> 2023-02-10 11:08:05 UTC https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476271901 JOHN DALTON (1803) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476272956 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).


]]> 2023-02-10 11:09:24 UTC https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476272956 JJ THOMSON (1897) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476274934 He discovered negatively charged particles inside the atom (electrons). ]]> 2023-02-10 11:11:32 UTC https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476274934 ERNEST RUTHERFORD (1909-1911) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476275805 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. ]]> 2023-02-10 11:12:29 UTC https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476275805 NIELS BOHR (1913) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476276567 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-10 11:13:17 UTC https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476276567 SCHRODINGER AND HEISENBERG (1926) mikelsoraluce https://padlet.com/mikelsoraluce/e0e0qwoz642pcmj0/wish/2476277916 He proposed that electrons do not travel in definite paths around the nucleus.


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