https://padlet.com/9750/6lnsj23kx66s Time line of 5 men who discovered things about the atom & also differ models they made. en-us 2017-09-07 15:42:22 UTC 2025-10-17 18:27:47 UTC hello@padlet.com 9750 https://padlet.com/9750/6lnsj23kx66s/wish/185569833 Overview- Came up with the Atom Theory and backed up Demo.'s idea.

Atomic theory - States that matter is composed of discrete units called atoms.

Downfall- The indivisibility of an atom was proved wrong, an atom can be further subdivided.]]> 2017-09-07 15:46:35 UTC https://padlet.com/9750/6lnsj23kx66s/wish/185569833 9750 https://padlet.com/9750/6lnsj23kx66s/wish/185573455 Theory - showed that cathode rays were negatively charged.

PPM - Plum Pudding Model, atoms are made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.

Downfall: scientists found out that the positively charged alpha particles were being repelled and deflected by a tiny concentration of positive charge in the atom, replaced his model with the nuclear atom model.]]> 2017-09-07 15:53:30 UTC https://padlet.com/9750/6lnsj23kx66s/wish/185573455 9750 https://padlet.com/9750/6lnsj23kx66s/wish/185577261 Theory - That atoms are mostly empty spaces // found nucleus.

Model - Basically a corrected model of JJ's.

Downfall - Said that a dense, heavy, positively charged nucleus surrounded by negative electrons that balance out the charge of the atom, But he didn't take into account the electrons properties.]]> 2017-09-07 16:00:24 UTC https://padlet.com/9750/6lnsj23kx66s/wish/185577261 9750 https://padlet.com/9750/6lnsj23kx66s/wish/185577404 Theory - proton as nucleus, with an electron moving in a orbit around it, each orbit corresponding to a specific energy state.

Model - depicts the atom as a small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus. think of it as a solar system.

Downfall- actually, people still use his model for references.]]> 2017-09-07 16:00:39 UTC https://padlet.com/9750/6lnsj23kx66s/wish/185577404 9750 https://padlet.com/9750/6lnsj23kx66s/wish/185577533 Theory - Contributed to the wave theory of matter & other thing in the Quantum Physics field.

Model - the quantum mechanical model // mathematical equations to describe the likelihood of finding an electron in a certain position. 

Downfall- while people do not use his models as much, they haven't been proven incorrect.]]> 2017-09-07 16:00:51 UTC https://padlet.com/9750/6lnsj23kx66s/wish/185577533