Here's why:
* Covalent Radius: When two identical atoms bond covalently, they share electrons equally. The distance between their nuclei is considered the bond length. The covalent radius is defined as half the bond length.
* Metallic Radius: In metals, atoms are packed closely together in a lattice. The metallic radius is defined as half the distance between two adjacent nuclei in the metallic lattice.
Important Note: The atomic radius is not a fixed value. It can vary depending on the type of bond, the number of bonds, and the electronegativity of the atoms involved.
