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Q.

The radius of the first orbit of hydrogen is 0.53Å . The radius of second orbit of He+ would be

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a

1.06Å

b

2.12Å

c

0.53Å

d

0.26Å

answer is A.

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Detailed Solution

Radius of second orbit of 2 He+=0.53×n2ZÅ

He+=0.53×42Å

r2 for He+=1.06 Å

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The radius of the first orbit of hydrogen is 0.53Å . The radius of second orbit of He+ would be