Q.

The most probable radius (in pm) for finding the electron in He+ is

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a

0.0

b

52.9

c

26.5

d

105.8

answer is C.

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Detailed Solution

rn =ao×n2Zwhere  a0=52.9  pm.  For  helium ion,  Z=2.rmp=r1 =52.92=26.45  pm
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The most probable radius (in pm) for finding the electron in He+ is