Question

why atomic radius of an element is not possible to measure in its isolated state ​

Answer 1

Answer:

The Size of Atoms: Metallic Radii

The size of an isolated atom can't be measured because we can't determine the location of the electrons that surround the nucleus. We can estimate the size of an atom, however, by assuming that the radius of an atom is half the distance between adjacent atoms in a solid.

Answer 2

Explanation:

because atom doesn't have definite boundary.(without boundary we can't define) as atomic radius itself means distance between the nucleus and outer most shell which acts like a boundary to atom.electrons surrounding the nucleus exist in an electron cloud. we can predict the probability of where electrons are but not their exact location

I hope you understand better