The Bohr orbit radius for the hydrogen atom (n=1) is approximately 0.530 Å . The radius for the first excited state (n=2) orbit is (in Å )

Step-by-step solution

Given : Radius of hydrogen atom =0.530 Å , Number of excited state (n)=2 and atomic number of hydrogen atom (Z)=1 . We know that the Bohr radius (r)= n^2 Z radius of atom = (2)^2 1 0.530 =4 0.530=2.12 Å