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Question

A hydrogen atom has an orbit which has a diameter of about 16.92 Ao. What is the maximum number of electrons that can be accommodated in that orbit?

A
8
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B
32
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C
50
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D
72
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Solution

The correct option is B 32
Given:
Diameter = 16.92 Ao
radius = 8.46 Ao
(for hydrogen atom Z=1)
Hence,
r=n2×0.529 Ao
8.46=n2×0.529
n2 = 16
n=4
Therefore, the maximum number of electron in the fourth orbit is = 2n2
= 2×42 = 32

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