Question

scientists have changed the model of the atom as they have gathered new evidence. one of the atomic models is shown below. what experimental evidence led to the development of this atomic model from the one before it? a few of the positive particles aimed at a gold foil seemed to bounce back the colors of light emitted from heated atoms had very specific energies equations were used to identify regions around the nucleus where electrons would likely be. cathode rays were bent in the same way whenever a magnet was brought near them.

Explanation:

• Option A: Rutherford's gold - foil experiment (where a few positive particles bounced back) led to the development of the nuclear model of the atom (which is a change from previous models like Thomson's plum - pudding model).
• Option B: The specific energies of light emitted from heated atoms is related to the Bohr model (which is a further development after the nuclear model).
• Option C: Using equations to identify electron regions is related to the quantum mechanical model (a later development).
• Option D: Cathode rays being bent by a magnet was part of Thomson's work on discovering the electron (related to the plum - pudding model, not a change from it in the way the question asks).

Answer:

A. A few of the positive particles aimed at a gold foil seemed to bounce back