Question

Define atomic size of an element.
give its unit

Answer 1

atomic size of an element is the distance from the center of the atom that is nucleus( protons) to the last shell of the atom which the electrons occupy.
its unit is pmi

Answer 2

Answer: The definition is given below and it is measured in Angstroms or picometers.

Explanation:

Atomic radius is defined as the distance from the center of the nucleus to the boundary of the surrounding cloud of electrons. It can b defined into 5 different types:

1. Metallic radius
2. Vander walls radius
3. Ionic radius
4. Covalent radius
5. Bohr radius

This term is measured in Angstroms $\AA$ or picometers (pm).