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:

The model shown is the plum - pudding model. The Rutherford gold - foil experiment, where a few positive particles aimed at a gold foil bounced back, led to the development of a new model (the nuclear model) from the plum - pudding model. This was because the plum - pudding model couldn't explain the large deflections of the positive particles.

Answer:

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