Question

I) Briefly, tell how was Rutherford's model of the atom was "quantized?" (a short description of what his model was is appropriate.)

II) What observation or experiment disclosed a failure of Rutherford's model which Bohr's model explained? (How was Bohr's model an improvement?)

III) Briefly, how was Bohr's model of the atom quantized differently from Rutherford's?

Answer 1

1)

He said that electrons revolved around the dense nucleus.
His model was quantized in the sense that electrons carried elementary charge. That means minimum charge possible or quantized charge

2)
Moving charge radiates energy. That would make the atom decay if electron keeps revolving. This failed the Rutherford model. and explained by Bohr.

3)

Bohr's model quantized the angular momentum of electrons. That suggested that electrons can only move at fixed distances (orbits)