Question

define radius of orbit of electron

Answer 1

The Bohr radius, symbolized a , is the mean radius of the orbit of an electron around the nucleus of a hydrogen atom at its ground state (lowest-energy level). The value of this radius is a physical constant; a is approximately equal to 5.29177 x 10 -11 meter (m). 

Answer 2

The Bohr radius, symbolized a , is the mean radius of the orbit of an electronaround the nucleus of a hydrogen atom at its ground state (lowest-energy level).