https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme en-us 2023-02-14 11:09:28 UTC 2025-12-11 20:24:25 UTC hello@padlet.com youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2481609496 He proposed that electrons do not travel in definite paths around the nucleus.]]> 2023-02-14 11:24:52 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2481609496 youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483193669 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 09:14:48 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483193669 youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483197876 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 09:19:00 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483197876 youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483200672 He discovered negatively charged particles inside the atom (electrons).]]> 2023-02-15 09:21:40 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483200672 youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483203642 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 09:24:27 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483203642 youneselouafi https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483205431 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. ]]> 2023-02-15 09:26:14 UTC https://padlet.com/youneselouafi/2lp3cfh9vl6zsxme/wish/2483205431