Step 1: Hydrogen spectrum series.
The hydrogen spectrum consists of several series, each corresponding to transitions of electrons between energy levels. The visible portion of the hydrogen spectrum corresponds to the Balmer series.
Step 2: Series of hydrogen spectrum.
- Lyman series: Corresponds to transitions from higher levels to the first level and lies in the ultraviolet region.
- Balmer series: Correct, corresponds to transitions from higher levels to the second level and lies in the visible region.
- Paschen series: Corresponds to transitions from higher levels to the third level and lies in the infrared region.
- Brackett series: Corresponds to transitions from higher levels to the fourth level and lies in the infrared region.
Step 3: Conclusion.
Thus, the Balmer series lies in the visible portion of the hydrogen spectrum.