THE HISTORY OF THE ATOM by Aiur Alkorta Iparraguirre https://padlet.com/aiuralkorta/qyixmea14exnhbr2 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 2023-02-15 11:21:46 UTC hello@padlet.com https://padlet.net/icons/png/1f9f2.png DEMOCRITUS (440 BC) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2474760108 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 09:58:01 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2474760108 JOHN DALTON (1803) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481123465

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).
]]> 2023-02-14 08:30:38 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481123465 JJ THOMSON (1897) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481124844 He discovered negatively charged particles inside the atom (electrons). ]]> 2023-02-14 08:32:03 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481124844 ERNEST RUTHERFORD (1909-1911) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481129875 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 08:37:12 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481129875 NIELS BOHR (1913) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481131087 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. ]]> 2023-02-14 08:38:36 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481131087 SCHRODINGER AND HEISENBERG (1926) aiuralkorta https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481132918 He proposed that electrons do not travel in definite paths around the nucleus.]]> 2023-02-14 08:40:34 UTC https://padlet.com/aiuralkorta/qyixmea14exnhbr2/wish/2481132918