AIPMT PRELIMS2003Physics-Atomic Structure
AIPMT PRELIMS 2003 Physics Bohr's Model MCQ Question
Type: MCQ-conceptual-Medium-Class 11
In which of the following systems will be radius of the first orbit (n = 1) be minimum -
A
Doubly ionized lithium
B
Singly ionized helium
C
Deuterium atom
D
Hydrogen atom
Correct Answer
Option A
Detailed Explanation
The radius of the orbit is given by r = n²h²/4π²me²Z. For minimum radius, Z should be maximum. Doubly ionized lithium has the highest Z (Z=3).
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