Heavy Metals

Definition:

The term "heavy metal" is a poorly defined tag used to refer to a variety of toxic metallic substances.

While not precise in definition, by common convention the term refers to elements including:

• Lead
• Mercury
• Cobalt
• Cadmium
• Copper
• Zinc

As most commonly used, the term "heavy metal" is negative, and suggests a situation where one of these substances is a contaminant potentially leading to illness.