In 1897, J. J. Thomson demonstrated in an experiment that cathode rays were deflected by an electric field. This suggested that cathode rays were composed of negatively charged particles found in all atoms. Thomson concluded that the atom was a positively charged sphere of almost uniform density in which negatively charged particles were embedded. The total negative charge in the atom was balanced by the positive charge, making the atom electrically neutral.
In the early 1900s, Ernest Rutherford bombarded a very thin sheet of gold foil with alpha particles. After interpreting the results of the gold foil experiment, Rutherford proposed a more sophisticated model of the atom.
66 State one conclusion from Rutherford’s experiment that contradicts one conclusion made by Thomson. [1]
HIGHLIGHT TO SEE THE ANSWER
An atom has a nucleus that is positively charged. An atom is mostly empty space. Negatively charged particles are located outside the positive nucleus. |
67 State one aspect of the modern model of the atom that agrees with a conclusion made by Thomson. [1]
HIGHLIGHT TO SEE THE ANSWER
An atom has equal amounts of negative and positive charge. An atom has an equal number of protons and electrons. All atoms contain electrons. Electrons are negatively charged. |