NEETPhysics-Atomic Structure
NEET Physics Bohr Model MCQ Question
Type: MCQ-numerical-Medium-Class 11
If radius of second Bohr orbit of the He⁺ ion is 105.8 pm, what is the radius of third Bohr orbit of Li²⁺ ion?
A
158.7 pm
B
15.87 pm
C
587 pm
D
158.7 Å
Correct Answer
Option A
Detailed Explanation
The radius of the nth orbit in a hydrogen-like ion is given by r = n²h²/4π²me²Z. For Li²⁺, Z = 3 and n = 3. Using the given radius for He⁺, the calculation shows the radius for Li²⁺ is 158.7 pm.
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