A) Deuterium atom
B) Hydrogen atom
C) Doubly ionized lithium
D) Singly ionized helium
Correct Answer: C
Solution :
Radius of nth Bohr's orbit of hydrogen like atom, \[{{r}_{n}}\propto \frac{{{n}^{2}}}{Z}\] where, Z, is atomic number. For first orbit,\[n=1\] \[\therefore \] \[{{r}_{n}}\propto \frac{1}{Z}\] Now, for radius of first orbit to be minimum, its atomic number must be greater. Here in the problem, atomic number Z is greater for doubly ionized lithium and is Z = 3, Hence, for this system the radius of first orbit will be minimum.
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