https://padlet.com/s1632662/Bookmarks By: Emanuel Sanchez, Jacob en-us 2022-04-04 15:12:23 UTC 2025-11-04 00:16:41 UTC hello@padlet.com s1632662 https://padlet.com/s1632662/Bookmarks/wish/2128878182 He theorized that all material bodies are made up of indivisibly small “atoms.”]]> 2022-04-04 15:18:35 UTC https://padlet.com/s1632662/Bookmarks/wish/2128878182 s1632662 https://padlet.com/s1632662/Bookmarks/wish/2128878712 The first complete attempt to describe all matter in terms of atoms and their properties.]]> 2022-04-04 15:18:50 UTC https://padlet.com/s1632662/Bookmarks/wish/2128878712 s1667432 https://padlet.com/s1632662/Bookmarks/wish/2139215220 He discovered that there are two types of radiation, alpha and beta particles, coming from uranium. He found that the atom consists mostly of empty space, with its mass concentrated in a central positively charged nucleus.]]> 2022-04-11 14:02:45 UTC https://padlet.com/s1632662/Bookmarks/wish/2139215220 s1667432 https://padlet.com/s1632662/Bookmarks/wish/2139215706 Niels Bohr proposed that some physical quantities only take discrete values. Electrons move around a nucleus, but only in prescribed orbits, and if electrons jump to a lower-energy orbit, the difference is sent out as radiation.]]> 2022-04-11 14:03:03 UTC https://padlet.com/s1632662/Bookmarks/wish/2139215706 s1667432 https://padlet.com/s1632662/Bookmarks/wish/2139216294

]]> 2022-04-11 14:03:26 UTC https://padlet.com/s1632662/Bookmarks/wish/2139216294 s1667432 https://padlet.com/s1632662/Bookmarks/wish/2144632894 experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."]]> 2022-04-15 04:21:13 UTC https://padlet.com/s1632662/Bookmarks/wish/2144632894