The metal is a material that conducts heat, conducts electricity and reflects light. At room temperature, in most cases, it is solid state. Can be attacked by acids and bases.

The metal may be one of the chemical elements in the periodic table in the metals category (the other elements are semimetal and non-metal) or an alloy. In fact, the term "metallic material" refers to both metals and their alloys.

For metatalli heavy chemical elements are metals category (periodic table), with relatively high density and high toxicity (for the human body) in low concentrations. The heavy metals are: thallium, lead, cadmium, mercury, chromium and arsenic. The heavy metals are components of the Earth's crust and are not degraded or destroyed.

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