Question

What will be the Bohr’s atomic radius for the first orbit of Li (Z=3). Given : Bohr’s atomic

radius of hydrogen at first orbit is 0.51 Å.​

Answer 1

Radius of the nth orbit of an electron is given by    r  

n =ro

​Zn2

 

​For hydrogen atom,   Z=1

⟹ r  

n =ro

​n2

 So, for third orbit    n=3

Thus radius of third orbit   r  3

=r o ×3  2

=9r  o

​  

u can use this to find the answer

Answer 2

Answer:

Radius of the nth orbit of an electron is given by r

n

=r

o

Z

n

2

For hydrogen atom, Z=1

⟹ r

n

=r

o

n

2

So, for third orbit n=3

Thus radius of third orbit r

3

=r

o

×3

2

=9r

o