HISTORY OF THE ATOM by Ugaitz Larrañaga Zabala https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix EVERYTHING IS MADE OF ATOMS en-us 2023-02-09 11:06:45 UTC 2023-02-15 08:36:17 UTC hello@padlet.com https://padlet.net/icons/png/1f52c.png DEMOCRITUS (440 BC) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483143845 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 08:25:28 UTC https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483143845 JOHN DALTON (1803) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483145619 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 08:27:13 UTC https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483145619 JJ THOMSON (1897) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483146928 He discovered negatively charged particles inside the atom (electrons). 


]]> 2023-02-15 08:28:39 UTC https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483146928 ERNEST RUTHERFORD (1909-1911) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483148269 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 08:30:06 UTC https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483148269 NIELS BOHR (1913) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483153643 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-15 08:35:10 UTC https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483153643 SCHRODINGER AND HEISENBERG (1926) ugaitzlarranaga https://padlet.com/ugaitzlarranaga/1drxbbukdma8r8ix/wish/2483154213 He proposed that electrons do not travel in definite paths around the nucleus.


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