THE HISTORY OF THE ATOM by Maialen Morales Echaniz https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu Everything is made of atoms. en-us 2023-02-09 09:50:03 UTC 2023-02-14 08:46:05 UTC hello@padlet.com https://padlet.net/icons/png/1f427.png maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2474757448 JOHN DALTON (1803)

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 09:55:42 UTC https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2474757448 maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2474764004 DEMOCRITUS (440 BC)

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 10:01:28 UTC https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2474764004 maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481132794 JJ THOMSON (1897) 

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


]]> 2023-02-14 08:40:27 UTC https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481132794 maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481136305 ERNEST RUTHERFORD (1909-1911)

He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


]]> 2023-02-14 08:44:10 UTC https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481136305 maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481137255 NIELS BOHR (1913)

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 
]]> 2023-02-14 08:45:13 UTC https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481137255 maialenmorales https://padlet.com/maialenmorales/5cog1ykg7y0k1uhu/wish/2481138105 SCHRODINGER AND HEISENBERG (1926)

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


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