Here's why:
* Sodium is a metal: Metals have a unique structure where their outermost electrons are loosely bound to the atom. These electrons are free to move throughout the entire structure, forming a "sea" of electrons.
* Metallic Bonding: The positive metal ions are held together by the electrostatic attraction between these free electrons and the positively charged ions. This attraction is what gives metals their characteristic properties, like conductivity and malleability.
Therefore, while individual sodium atoms are held together by metallic bonding in a solid piece of sodium, they don't form covalent or ionic bonds with each other.
