Question

what is the distance between neucleus and the electrons

Answer 1

neucleus is center of atom

electron is  charged species rotating around the 
neucleus

Answer 2

According to 2010 CODATA, the charge radius of a proton is0.8775(51)*10^-15 m. Doing a direct ratio between the two, we find that the Bohr radius is 60305 times larger than the radius of the nucleus. So, the electron would typically be a bit over 10 miles away from the proton in the scale given in the description.