https://padlet.com/beaumontunified/dmln46og1dmclqo0 By: Andrew Shin Note: Each section, scroll down to see more information. en-us 2020-10-06 19:02:41 UTC 2025-08-04 03:00:28 UTC hello@padlet.com ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808915990 Name: Aristotle 
Date: 384 - 322 B.C.
Discovery: Aristotle did not believe that empty space could exist. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air.

]]> 2020-10-07 02:04:28 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808915990 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808946682 Name: Democritus
Date: 460 - 370 B.C.
Discovery: Democritus believes that matter is composed of atoms, which move through empty space. ]]> 2020-10-07 02:21:32 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808946682 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808959332 Name: John Dalton
Date: 1766 - 1844
Discovery: Matter is composed of extremely mall particles called atoms. Indivisible and indestructible.]]> 2020-10-07 02:28:30 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808959332 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808971910 Name: J.J Thomson
Date: 1890s
Discovery: Discovery of electron. Thomson proposed a model of the atom as a sphere of positive matter with electrons positioned based on electrostatic forces.]]> 2020-10-07 02:35:42 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808971910 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808979568 Name: Ernest Rutherford
Date: 1911
Discovery: Ernest postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.]]> 2020-10-07 02:40:03 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808979568 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808997240 Name: Robert Andrews Millikan
Date: 1909
Discovery: Measured the charge of an electron using oil droplets.]]> 2020-10-07 02:50:33 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/808997240 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809006901 Name: Sir William Crookes 
Date: 1879
Discovery: Crookes discovered the element thallium and show there is a negative charge in atoms. Also was the one who reconstructed Cathode Ray. ]]> 2020-10-07 02:56:20 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809006901 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809012672 Name: James Chadwick
Date: 1932
Discovery: James is the man who discovered the neutron and elementary particles devoid of any electrical charge.]]> 2020-10-07 02:59:52 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809012672 ashin30401 https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809019986 2020-10-07 03:04:16 UTC https://padlet.com/beaumontunified/dmln46og1dmclqo0/wish/809019986