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Q.

what atomic number of an element “X” would have to become so that the 4th orbit around element X would fit inside the 1st Bohr orbit of H atom ?

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a

3

b

4

c

16

d

25

answer is C.

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Detailed Solution

r1=0.529Å; r4(X)=r1×n2Zr4(X)⇒0.529×(4)2Z; Z=16
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