The diameter of the nucleus is in the range of 1.70 fm (1.70 × 10 m) for hydrogen (the diameter of a single proton) to about 11.7 fm for uranium. These dimensions are much smaller than the diameter of the atom itself (nucleus + electron cloud), by a factor of about 26,634 (uranium atomic radius is about 156 pm (156 × 10 m)) to about 60,250 (hydrogen atomic radius is about 52.92 pm).