See under heavy metals.
Term for a group of metals whose density or atomic mass exceeds a certain value. Colloquially, heavy metals are often considered "toxic substances". However, this is not correct, because iron, copper, manganese, molybdenum and zinc are among the heavy metals that are essential for life. Arsenic, lead, cadmium, chromium, nickel and mercury (amalgam) are considered dangerous...
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Roman Horvath MW
Domäne Wachau (Wachau)