https://padlet.com/rileysage_h/1vqsjhxmlz68 By Riley Hoffman and Julia Kraft en-us 2019-02-05 17:33:32 UTC 2025-10-09 15:49:08 UTC hello@padlet.com 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327907845 Everything is composed of “atomos,” tiny indivisible particles that differ in size and shape and are in constant motion through a void. When they collide, atoms could rebound or stick together, leading to changes in matter. ]]> 2019-02-05 17:34:58 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327907845 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327908918 Dalton’s Atomic Theory: All matter is made of indivisible and indestructible particles called atoms, which are unique to each element. Compounds are combinations of atoms, and a chemical reaction is a rearrangement of atoms. ]]> 2019-02-05 17:36:42 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327908918 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327909417 Discovered the electron.]]> 2019-02-05 17:37:29 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327909417 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327910304 Made progress in the study of radioactivity which led to the discovery of the elements radium and polonium. ]]> 2019-02-05 17:39:01 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327910304 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327911320 Conducted the Gold Foil Experiment and concluded that the atom consists of a small, dense, positive nucleus in the center with negative electrons surrounding it. ]]> 2019-02-05 17:40:36 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327911320 347121 https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327912434 Proposed a theory for the hydrogen atom based on quantum theory. Proposed that energy is transferred only in certain well defined quantities. Electrons only move around the nucleus in specific orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted. His theory explains why atoms emit light in fixed wavelengths.]]> 2019-02-05 17:42:11 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327912434 rileysage_h https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327912543 Proved the existence of the neutron.]]> 2019-02-05 17:42:21 UTC https://padlet.com/rileysage_h/1vqsjhxmlz68/wish/327912543