Question

What is the ratio of radius of atom to radius of nucleus

Answer 1

Nuclear radius ~ 10-15 m or 1 fm (femtometer or fermi)

Atomic radius ~ 10-10 m or 10-8 cm or 1 Å (1 angstrom).

Answer 2

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The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons. ... Electrons do not have definite orbits, or sharply defined ranges