[AIIMS 2005]
A) 0.0
B) 52.9
C) 26.5
D) 105.8
Correct Answer: C
Most probable radius = a0 / Z where a0 = 52.9 pm. For helium ion, Z = 2. rmp = $ \frac{52.9}{2} $ = 26.45 pm.
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