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Bohr model

2 PYQ across 1 exam · 2023–2025 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

20231 PYQ
GEOQ44
The radius of the first orbit (n = 1) of a hydrogen atom is 0·529 Å. Then the radius of the second orbit (n = 2) of He⁺ ion will be…
20251 PYQ
GEOQ21
The radius of the first stationary orbit of hydrogen atom is…
Related concepts — explore their timelines too
Atomic radiusAtomic structure
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