Besides that this is not seen in the story, this is really stretching the definition of metal.

Metals as chemical elements are pretty much in everything. Sodium is a metal and forms table salt. Sodium also forms other compounts important for organic life.

However what makes metal "metal" from our perspective is usually the loose electrons that give it its conductivity and shiny look. Those properties are properties of the atomic structure (that is, multiple "metal" atoms), not individual atoms.