Q. The most suitable unit for expressing nuclear radius is:
Answer: angstrom
Notes: The atomic radius is a measure of the size of an atom. It is defined as one-half the distance between the nuclei of two identical atoms that are bonded together. Angstrom is the most common unit used for measuring atomic radius. It is equivalent to 1 × 10(to the power –10) m. Under most definitions, the radii of isolated neutral atoms range between 30 and 300 pm (trillionths of a metre), or between 0.3 and 3 angstroms.