An early model of the atom, as shown below, was proposed by J.J. Thomson in 1904. He described the structure of the atom as a positively charged sphere with small, negatively charged electrons embedded inside. These electrons are free to circulate in rings within the sphere.
[see uploaded image]
Which of the following provide a correct comparison of Thomson’s model with the currently accepted model of the atom?
- Both correctly describe the atom as consisting of electrons and protons.
- Both correctly describe the electrons as freely circulating inside the atom.
- The currently accepted model describes the positive charges as being concentrated in a tiny core of the atom.
- The currently accepted model describes the presence of the neutral particles which contribute partially to the mass of the atom.
A. III and IV only
B. I, II and III only
C. II, III and IV only
D. I, II, III and IV