Here's why:

* Properties of Metals: Metals are typically shiny, malleable (can be hammered into shapes), ductile (can be drawn into wires), good conductors of heat and electricity, and have a tendency to lose electrons in chemical reactions.

* Sodium's Properties: Sodium fits all of these descriptions. It's a silvery-white, soft metal that can be easily cut with a knife. It's also a very good conductor of heat and electricity.

Let me know if you'd like to know more about metals, metalloids, or nonmetals!