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Explanation:
The most suitable unit for expressing nuclear radius is Fermi. The average size of an atom is R0 = 1.2*10-15 m.
Fermi was a physicist who came up with the concept of the fermi unit. The word “fermi“ is used in physical science and chemistry to measure extremely small amounts of something.
In physics, for example, one fermi could be defined as the amount of space an electron would take up if it were traveling at the speed of light, which is about 300 million meters per second. The fermi unit is one ten–millionth of a meter (1E–10 m).
In nuclear science, the fermi unit is used to measure how big an atomic nucleus is. The word “fermi“ can also be used in chemistry to refer to the amount of space that a hydrogen atom would take up if it were traveling at light speed, which means it would have about one–quarter of a millionth of a centimeter in diameter.
A “fermi–steradian“ is one ten millionth of the total amount of light energy that falls on an object from all directions (1E–10 sr).