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 image shows the plum - pudding model of the atom. The Rutherford gold - foil experiment, where a few positive particles bounced back, led to the development of a new model (nuclear model) from the plum - pudding model. The plum - pudding model was replaced because the gold - foil experiment showed that the positive charge was concentrated in a small nucleus, not spread out as in the plum - pudding model.

Answer:

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