Answer :

We know that the radius (r) of an orbit of an atom of atomic number Z, according to Bohr's Model is:



Where, n= Principal Quantum number and Z= Atomic Number.


Thus, for a fixed n (n=1), the radius of an orbit is inversely proportional to Z.


Among the options, lithium ion has the highest atomic number, Z=3.


Hence, option (d) is the correct answer.

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