Final answer:
The emission of light from hydrogen atoms when electrons transition to the n = 2 energy level belongs to the visible spectrum and is known as the Balmer series transitions.
Step-by-step explanation:
The transition of electrons from higher energy levels to the n = 2 energy level in hydrogen atoms results in the emission of light in the visible portion of the electromagnetic spectrum. This set of transitions is known as the Balmer series transitions. For example, the transition from n = 3 to n = 2 produces red light at 656 nm, from n = 4 to n = 2 produces green light at 486 nm, from n = 5 to n = 2 produces blue light at 434 nm, and from n = 6 to n = 2 produces violet light at 410 nm. These colors combine to give hydrogen its characteristic emission color.