Atoms and Nuclei

Step 1. Typical energy scale of atomic levels
Atomic energy levels (like in the hydrogen atom) are of the order of electron volts (eV).
E‌atomic ‌∼1eV
Step 2. Typical energy scale of nuclear levels
Nuclear energy level spacings are typically in the range of MeV (mega electron volts):
E‌nuclear ‌∼1MeV=106eV
Step 3. Ratio of orders
‌

E‌nuclear ‌

E‌atomic ‌

∼‌

106eV

1eV

=106