What is the angle between the nitrogen-oxygen bonds in the nitrate ion

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

What happens when light is scattered?

Stage in which a typical star has completely stopped fusion