https://padlet.com/459936/xc1x5mweo9c6 Think like a Proton: Be Positive! Paris & Emily en-us 2019-02-05 13:51:16 UTC 2019-02-05 14:21:54 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Balance.png https://padlet.com/459936/xc1x5mweo9c6/wish/327760815 2019-02-05 13:57:45 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327760815 https://padlet.com/459936/xc1x5mweo9c6/wish/327761230 In 422 BC Democritus developed the idea that all matter is made up of small indestructible units, called atoms.]]> 2019-02-05 13:58:30 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327761230 459936 https://padlet.com/459936/xc1x5mweo9c6/wish/327763584 In 1803, John Dalton suggested that elements were made up of atoms that were identical and had the same mass. Moreover, he proposed that compounds were atoms from different elements that were combined together.]]> 2019-02-05 14:02:10 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327763584 https://padlet.com/459936/xc1x5mweo9c6/wish/327763809 Thomson determined the charge to mass ratio of electrons. He discovered electrons in 1897. ]]> 2019-02-05 14:02:32 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327763809 https://padlet.com/459936/xc1x5mweo9c6/wish/327766144 In 1898, Curie discovered radium and polonium and coined the term radioactivity after studying the decay process of uranium and thorium.]]> 2019-02-05 14:06:35 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327766144 https://padlet.com/459936/xc1x5mweo9c6/wish/327767980 In 1932, Chadwick discovered neutrons, particles whose mass was close to that of a proton.]]> 2019-02-05 14:09:41 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327767980 459936 https://padlet.com/459936/xc1x5mweo9c6/wish/327768026 In 1898, Ernest Rutherford discovered alpha, beta, and gamma rays in radiation. ]]> 2019-02-05 14:09:46 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327768026 459936 https://padlet.com/459936/xc1x5mweo9c6/wish/327770260 In 1992, Niels Bohr proposed an atomic structure theory, stating that the outer orbit of an atom held more than the inner orbit.]]> 2019-02-05 14:13:28 UTC https://padlet.com/459936/xc1x5mweo9c6/wish/327770260