Heavy metals

chemical elements (numbering more than 40) with atomic weight more than 50 atomic units. Concept H.m. in many aspects coincides with a concept of “mictoelements”, but also includes separate elements of heightened concentrations. Among H.m. there are lead, zinc, cadmium, mercury, molybdenum, manganese, nickel, tin, cobalt, titanium, copper, vanadium, etc.