Which of the Following Statements Regarding the Sizes of Atoms

Multiple Choice

Which of the following statements regarding the sizes of atoms is NOT true?

A) The atomic radius of an atom that exists as a diatomic molecule is half the distance between nuclear centers.
B) The ionic radius is derived from the distances between nuclear centers in ionic compounds.
C) The metallic radius is half the distance between atomic centers in the solid metal.
D) The edge of an atom can be described exactly.
E) The radius of an atom depends on its environment.