Use the picture timeline above or the one in your notes to sort the pictures and the discoveries into the correct model nameShows a more complete understanding of how electrons move around a nucleus. (this is the present model we use today)Bohr's model shows that the negative electrons orbit the positive nucleusRutherford's model shows that negative electrons travel around a positive nucleus (center)Positive and negative charges float around the atom like raisins in plum puddingPlum-Pudding Model (1897)

Recall which of the following statements is a part of J.J Thomson's model of the atom. Electrons orbit the nucleus.1Positively charged particles exist within atoms.2There is a positive cloud with electrons scattered through it.

Who suggested electrons orbit nucleus?

Which of the following occurred most recently?The development of the atomic model (which says that all matter is made of tiny, indivisible spheres)The development of the Rutherford modelThe development of the plum pudding modelThe development of the Bohr model2Which of the following statements best describes the plum pudding model?The atom is made up of a ball of positive charge with electrons dotted around inside itThe atom is made up of a ball of negative charge with protons dotted around inside itThe atom is made up of a ball of protons, neutrons and electrons which are spread evenly throughout itThe atom contains positive charge in its centre which electrons orbit around3The Rutherford model is based on the results of the Geiger-Marsden experiment.  In this experiment, alpha particles were directed at a piece of gold foil.  An alpha particle is the same thing as the nucleus of which element?HydrogenCarbonHeliumArgon4Which of the following statements about the Rutherford scattering (Geiger-Marsden) experiment is incorrect?A small number of alpha particles were deflected by small anglesThe experiment was conducted in airMost alpha particles went straight through the gold foilA tiny number of alpha particles (about 1 in 10,000) were deflected by angles of more than 90°5Which of the following is NOT stated by the Rutherford model?Electrons can only orbit the nucleus at specific distancesThe atom is mostly empty space and most of its mass is located in its centre (in the nucleus)Electrons orbit the nucleusThe nucleus and the alpha particle have the same type of charge (positive)6Which of the following statements about the Bohr model is incorrect?An electron can gain energy by absorbing electromagnetic radiationElectrons can only orbit the nucleus at specific distancesWhen an electron loses energy, electromagnetic radiation is emittedThe further away an electron is from the nucleus, the less energy it has

In 1932, James Chadwick discovered that some particles in the nucleus have no charge at all. He called them neutrons. Electrons (negatively charged particles) have been shown to orbit the nucleus at distances.

dentify the incorrect statement about Thomson’s model.A.In atom, the electrons are found in orbits.B.In an atom, negative charge is studded in the positively charged sphere and the magnitude of negative and positive charges isequal.C.All of theseD.Atom is electrically neutral.