https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8 ATOM THEORY TIMELINE en-us 2021-04-05 00:05:55 UTC 2025-12-18 04:22:14 UTC hello@padlet.com ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381550713 He believed that matter is made up of atoms, which are small,  hard particles.
He said the matter could not be broken down into smaller parts indefinitely.

]]> 2021-04-05 00:13:45 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381550713 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381554237 THE FIRST ATOMIC THEORY WAS CREATED BY HIM.
Atoms were regarded by Dalton as small, stable spheres.]]> 2021-04-05 00:15:54 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381554237 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381562092 According to Thomson's model, the atom is made up of electrons surrounded by a broth of positive charge to counteract the negative charges of the electrons, just like negatively charged "plums" surrounded by positively charged "pudding." Hans Geiger and Ernest Marsden's gold foil experiment in 1909 disproved the 1904 Thomson model.]]> 2021-04-05 00:20:29 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381562092 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381563446 The atom is largely hollow space, with almost all of its mass contained in a tiny central nucleus, according to Ernest Rutherford. The nucleus is positively charged and is surrounded by negatively charged electrons at a considerable distance.]]> 2021-04-05 00:21:14 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381563446 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381564940 Niels Bohr suggested a quantum theory-based theory for the hydrogen atom in 1913, stating that energy is transmitted only in such well-defined amounts. Electrons can only pass around the nucleus in specific orbits. A light quantum is released as a particle jumps from one orbit to another of lower energy.]]> 2021-04-05 00:22:08 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381564940 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381565998 James Chadwick used alpha particles to bombard beryllium atoms in 1932. An unexplained radiation was released. This radiation, according to Chadwick, is made up of ions with a neutral electrical charge and the density of a proton. The neutron was named after this atom.]]> 2021-04-05 00:22:40 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381565998 ramos136528131718 https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381567481 Erwin Schrodinger was a mathematician and physicist Erwin Schrödinger built an efficient model of the atom in 1926. The Schrödinger model considers the electron to be a wave and aims to classify the regions of space, or orbitals, where electrons are most likely to be located.]]> 2021-04-05 00:23:32 UTC https://padlet.com/cruz482604150076/xxlf2rxz6hnb5uj8/wish/1381567481