For simplicity this is written as r = n 2 a 0 , {\displaystyle r=n^{2}a_{0},\!} where a0, called the Bohr radius, is equal to 0.0529 nm.
Agar sederhana maka ditulis menjadi r = n 2 a 0 , {\displaystyle r=n^{2}a_{0},\!} dengan a0, disebut radius Bohr, sama dengan 0.0529 nm.