HISTORY OF THE ATOM by Nora Juaristi Ortega https://padlet.com/norajuaristi/eqqqms26ypz9u0vd They are really small ( tiny) particles. They are so small that we cannot see with oureyes en-us 2023-02-10 11:08:32 UTC 2023-02-14 09:34:11 UTC hello@padlet.com https://padlet.net/icons/png/1f469-1f52c.png DEMOCRITUS(440 BC) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476279535 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”. ]]> 2023-02-10 11:16:23 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476279535 JOHN DALTON (1803) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476281058
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 11:18:02 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476281058 JJ THOMSON (1897) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476284589 He discovered negatively charged particles inside the atom (electrons). 



]]> 2023-02-10 11:21:52 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476284589 ERNEST RUTHERFORD (1909-1911) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476286313 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 11:23:35 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476286313 NIELS BOHR (1913) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476289817 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. ]]> 2023-02-10 11:27:05 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2476289817 SCHRODINGER AND HEISENBERG (1926) norajuaristi https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2481301219 He proposed that electrons do not travel in definite paths around the nucleus.]]> 2023-02-14 09:27:52 UTC https://padlet.com/norajuaristi/eqqqms26ypz9u0vd/wish/2481301219