https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf en-us 2023-02-09 11:12:08 UTC 2026-02-12 17:58:15 UTC hello@padlet.com mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483145409

]]> 2023-02-15 08:27:02 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483145409 mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483148020 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 08:29:50 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483148020 mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483152300 He discovered negatively charged particles inside the atom (electrons). ]]> 2023-02-15 08:34:02 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483152300 mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483155108 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 08:36:38 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483155108 mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483157612 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels]]> 2023-02-15 08:39:16 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483157612 mohamedhajji2 https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483160177 He proposed that electrons do not travel in definite paths around the nucleus.]]> 2023-02-15 08:42:02 UTC https://padlet.com/mohamedhajji2/t0z11dbo89w4uwdf/wish/2483160177