**Annotation category:**

Chapter 1

Note: |

Following the link to the Carbon atom, one sees the second level of the
electron orbit is the size of the first level x n^{2}/(Z-2). Here,
n = 2 and Z = 6 so this factor comes out to be 1; the atomic
diameter given in the Table for Hydrogen is a good approximation
for the diameter of Carbon as well.

Thus, we are taking an object that is in fact 10^{-10} m across and representing
it with a tennis ball that is 0.06 m across. Taking ratios,

0.06/10^{-10} = X / 10^{-4} where X is the scaled up diameter of the hair.

X = 6 x 104 m - 60 kilometers wide.

At this scale, the atom is 0.06m across and the nucleus is 10^{-4} times this
width of 6 x 10^{-6} m. This is 0.06 times the width of a real hair, so no, your
eyes could not see the nucleus in a tennis-ball-sized atom.