THE HISTORY OF THE ATOM by Elaia Aizarna Etxenagusia Elaia https://padlet.com/elaiazarna/djki2zmvfjz95ym4 Everything is made of Atoms.They are really small (tiny) particles.They are so small that we cannot see them with our eyes. Atoms are made up of three particles:protons,neutrons and electrons. en-us 2023-02-08 11:18:07 UTC 2023-02-14 09:00:42 UTC hello@padlet.com https://padlet.net/icons/png/2721.png DEMOCRITUS (440 BC) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474753253 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 09:51:59 UTC https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474753253 JOHN DALTON (1803) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474756524 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 09:54:53 UTC https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474756524 JJ THOMSON (1897) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474761470 He discovered negatively charged particles inside the atom (electrons). 


]]> 2023-02-09 09:59:16 UTC https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474761470 ERNEST RUTHERFORD (1909-1911) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474762590 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


]]> 2023-02-09 10:00:16 UTC https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474762590 NIELS BOHR (1913) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474764248 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-09 10:01:42 UTC https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2474764248 SCHRODINGER AND HEISENBERG (1926) elaiazarna https://padlet.com/elaiazarna/djki2zmvfjz95ym4/wish/2481125983 He proposed that electrons do not travel in definite paths around the nucleus.


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