Question - How Is Metal Heavy?
Answer -
Not all metals are heavy. Hydrogen is a metal, and is the lightest element known. Lithium, also a metal is the third lightest element there are many heavy elements that are not metals. If you "Google" the definition of "metal" you will note the properties that qualify a substance as a metal. Mass (weight) is not the important factor. Common metals are heavy because they have a dense electron structure.