Atomic radius represents the distance from the nucleus to the outer shell of an element.
Concept #1: Understanding Atomic Radius
For a diatomic molecule, atomic radius is defined as half the distance between the nuclei in a molecule of two identical elements.
Example #1: If the sum of the atomic radii of diatomic carbon is 154 pm and of diatomic chlorine is 198 pm, what is the sum of the atomic radii between a carbon and a chlorine atom.
Practice: Which one of the following atoms has the largest atomic radius?