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1)

The radius of the 2nd  orbit of B4+ ion is 


A) 4.23 Å

B) 0.2340Å

C) 0.4232Å

D) 0.3241Å

Answer:

Option C

Explanation:

Radius of the nth orbit (rn)= 0.529×n2Z  Å

 For B4+ion, (Z) =5, second  orbit (n)=2

 r2(B4+)=0.529×(2)25 Å= 0.529×45Å

 r2(B4+)= 0.4232 Å