1. Modern Physics Atoms and Molecules 1 Thomson believed that the atom was like a ball of pudding with the electrons trapped inside like plums. positive nucleus negative electrons

2. Modern Physics Atoms and Molecules 2 Bohr believed that the atom was like a miniature solar system with the electrons revolving around a positive nucleus. Bohr asserted that the electrons could only have certain values of angular momentum.

3. Modern Physics Atoms and Molecules 3

4. Modern Physics Atoms and Molecules 4

5. Modern Physics Atoms and Molecules 5