Question

explain how niels bohr observations of hydrogens flame test and line spectrum led to his model of the atoms containing electron orbits around the nucleus

Answer 1

the thin emission lines corresponding to energy transitions of electrons are quantized (only certain values are allowed), which indicates that electrons can only occupy certain energy states; the model is built around this idea using a planetary model, electrons can only jump back and forth between these energy states or "orbits" (A more accurate description is the use of the term orbital).

Answer 2

If you need a refresher on the process watch this https://www.youtube.com/watch?v=GhAn8xZQ-d8&list=PLllVwaZQkS2rxqMXTH-cdE0LIX9Zi_oS1&index=4