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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

Most probable radius = $\frac{a_{o}}{Z}$
where a_o = 52.9 pm. For helium ion, Z = 2.
$r_{mp} = \frac{52 .9}{2} = 26 .45 pm$

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