Q.

Which state of Be3+ has the same orbit radius as that of the ground state ofhydrogen atom?

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a

3

b

2

c

4

d

5

answer is B.

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Detailed Solution

From Bohr's atomic model, atomic radius for nth state is given by the formula, r=0.529 n2ZA0Since for Be, z=4n24=121​Hence, n=2
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