What concept is illustrated by the use of advance organizers

The answer is Meaningful Learning.

Meaningful learning refers to the concept that an individual fully understood the learned knowledge, and that he or she knows the specific fact that relates to other stored facts.

Advance Organizer is a useful tool  for teachers in helping students remember new material.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

what experimental evidence led scientists to change from the previous model to this one?

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.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.