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Question

Which orbit of the triply ionized beryllium (Be3+) has the same orbit radius as that of the ground state of hydrogen atom?

A
n=2
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B
n=3
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C
n=1
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D
n=4
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Solution

The correct option is A n=2
The radius of ground state of hydrogen atom = 0.529 oA
Let the lone electron of the triply-ionized Be3+ correspond to the level n
From the given data, both the above radii are equal.
So,
0.529=0.529×n2Z
0.529=0.529×n24
[atomic number of Be=4 (Z=4)]
n=2

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