History of Atomic Theory

Match the scientist or philosopher with their contribution to atomic theory. Democritus Said that all matter is made up of tiny indivisible particles called atoms John Dalton Conducted experiments to prove that matter was made up of atoms and developed the basic postulates of atomic theory J.J. Thomson Developed the "plum pudding" model of the atom, in which an atom's negatively charged electrons are surrounded by a "sea" of positive charge. Ernest Rutherford Performed the gold foil experiment, which proved that atoms were made of mostly empty space and contained a positively charged nucleus. Niels Bohr Created a new model of the atom which stated that electrons occupied fixed orbitals or energy levels around the nucleus James Chadwick Discovered that the nucleus was made up a two subatomic particles: positively charged protons and neutrally charged neutrons. Which model of the atom best represents our current understanding of atomic structure? the solar system model the Bohr model the electron cloud model Click on the blue dots to label the parts of the atom shown below. electron proton neutron Which diagram shows the solar system model of the atom? Which diagram shows the electron cloud model of the atom? Which diagram shows the Bohr model of the atom? Match the each element with its chemical symbol. Sodium Na Krypton Kr Fluorine F Radium Ra Cobalt Co Hydrogen H Lead Pb