alleryWhich series of the hydrogen spectrum lies in the visible region?
ALyman
BPaschen
CBalmer
DBrackett
Answer & Solution
Correct answer: C. Balmer
1. Hydrogen spectral series are named for their common ending n.
2. Lyman ends at n = 1 (UV); Balmer at n = 2 (visible); Paschen at n = 3 (IR).
3. The visible-range emissions H-α (656 nm), H-β (486 nm), etc. all belong to Balmer.
4. Balmer series played a historic role in developing atomic theory.
_Source: syllabus Chemistry, Ch 2 "Structure of Atom", §2.4_
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