HISTORY OF THE ATOM by Irati Alberdi Galarraga https://padlet.com/iratialberdi2/ghuv7cprt062rru2 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 2023-02-09 11:07:12 UTC 2023-02-15 09:00:58 UTC hello@padlet.com https://padlet.net/icons/png/23f3.png DEMOCRITUS (440 BC) iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474849252 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 11:18:46 UTC https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474849252 JOHN DALTON (1803) iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474853693 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 11:23:01 UTC https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474853693 JJ THOMSON (1897) iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474855123 He discovered negatively charged particles inside the atom (electrons). 


]]> 2023-02-09 11:24:30 UTC https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474855123 ERNEST RUTHERFORD (1909-191 iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474859856 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 11:29:09 UTC https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2474859856 NIELS BOHR (1913) iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2483141863

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



]]> 2023-02-15 08:23:32 UTC https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2483141863 SCHRODINGER AND HEISENBERG (1926) iratialberdi2 https://padlet.com/iratialberdi2/ghuv7cprt062rru2/wish/2483146464
He proposed that electrons do not travel in definite paths around the nucleus.


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