Question

If `a_(0)` is the Bohr radius, the radius of then `n=2` electronic orbit in triply ionized beryllium is
A. `4a_(0)`
B. `a_(0)`
C. `a_(0)//4`
D. `a_(0)//16`

Answer 1

Correct Answer - B
`r=a_(0)=(n^(2))/(Z)=a_(0).(2^(2))/(4)=a_(0)`