https://padlet.com/beaumontunified/ap0m6jjcegaml53k en-us 2020-10-08 16:25:29 UTC 2025-10-24 22:54:42 UTC hello@padlet.com abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814491841 He developed a theory that was based on the four elements.]]> 2020-10-08 16:30:09 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814491841 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814492551 He created the first atomic model.]]> 2020-10-08 16:30:19 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814492551 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814493059 He proposed that all matter was composed of atoms, indivisible and indestructible building blocks.]]> 2020-10-08 16:30:26 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814493059 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814493774 He was most famous for his discovery of the neutron in an atom. He established that atomic number is determined by the numbers of protons in an atom.]]> 2020-10-08 16:30:36 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814493774 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814495742 He discovered the elementary charge of an electron using the oil-drop experiment.]]> 2020-10-08 16:31:03 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814495742 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814496964 He postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.]]> 2020-10-08 16:31:19 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814496964 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814497780 He proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."]]> 2020-10-08 16:31:30 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814497780 abuenaventura32930 https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814498856 He discovered the element thallium and show there is a negative charge in atoms.]]> 2020-10-08 16:31:42 UTC https://padlet.com/beaumontunified/ap0m6jjcegaml53k/wish/814498856