why are some metals referred to as heavy metals while others are not ?

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why are some metals referred to as heavy metals while others are not ?

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https://en.wikipedia.org/wiki/Heavy_metals

https://en.wikipedia.org/wiki/Heavy_metals
Heavy metals – Wikipedia
Chemistry Portal v t e Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers. The criteria used, and whether metalloids are included, vary depending on the author and context. [2]

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3113373

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3113373
Heavy metals and living systems: An overview – PMC
Introduction Any toxic metal may be called heavy metal, irrespective of their atomic mass or density. [ 1] Heavy metals are a member of an ill-defined subset of elements that exhibit metallic properties. These include the transition metals, some metalloids, lanthanides, and actinides.
Table 2Figure 1PMC Free Article

https://www.thoughtco.com / what-is-a-heavy-metal-608449

https://www.thoughtco.com / what-is-a-heavy-metal-608449
Heavy Metals in Science – Definition and Examples – ThoughtCo
Mercury In addition to being toxic, these elemental metals are also known or probable carcinogens. These metals are common in the environment, occurring in air, food, and water. They occur naturally in water and soil. Additionally, they are released into the environment from industrial processes. Source:

https://www.thoughtco.com/definition-of-heavy-metal-605190

https://www.thoughtco.com/definition-of-heavy-metal-605190
Heavy Metal Definition and List – ThoughtCo
Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Zirconium Niobium Molybdenum Technetium

https://www.sciencedirect.com/topics/chemistry/heavy-metal

https://www.sciencedirect.com/topics/chemistry/heavy-metal
Heavy Metal – an overview | ScienceDirect Topics
Reham Mahmoud Abu Shmeis, in Comprehensive Analytical Chemistry, 2022 4.2 Heavy metals Heavy metal ions are among the most harmful water pollutants. Heavy metals are essentially transition metals (e.g. Cd, Hg, Cr), elements in the lower left part of the periodic table (e.g. Pd, Sn), and some metalloids (e.g. ).

https://pubs.acs.org/doi/10.1021/ed074p1374

https://pubs.acs.org/doi/10.1021/ed074p1374
What Is a Heavy Metal? | Journal of Chemical Education – ACS Publications
Being a heavy metal has little to do with density, but rather concerns chemical properties. The metals that I have seen referred to as heavy metals comprise a block of all the metals in Groups 3 to 16 that are in periods 4 and greater. This seems to be a definition that should be generally useful.

https://www.ncbi.nlm.nih.gov/books/NBK557806

https://www.ncbi.nlm.nih.gov/books/NBK557806
Heavy Metals – StatPearls – NCBI Bookshelf
8 août 2022Heavy metal is a broad term used to describe a group of naturally occurring metallic elements of high molecular weight and density when compared to water.[1] At low concentrations, certain heavy metals, such as iron, zinc, copper, and manganese, are essential for human survival but can become toxic agents at higher concentrations. , such as arsenic, cadmium, lead, thallium …

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8511997

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8511997
Heavy Metals and Human Health: Possible Exposure Pathways and the …
Some metal ions, such as Na(I), K(I), Mg(II), and Ca(II), are essential nutrients required for body function, others can be toxic even at very low concentrations. Regarding metals, micronutrients such as zinc, copper, iron, and manganese can also cause adverse effects when present in excessive levels, or if their homeostasis is disturbed by …

https://chem.libretexts.org/Bookshelves/General_Chemistry/Map:_Chemistry_-_The_Central_Science_(Brown_et_al.)/07:_Periodic_Properties_of_the_Elements/7.06:_Metals_Nonmetals_and_Metalloids

https://chem.libretexts.org/Bookshelves/General_Chemistry/Map:_Chemistry_-_The_Central_Science_(Brown_et_al.)/07:_Periodic_Properties_of_the_Elements/7.06:_Metals_Nonmetals_and_Metalloids
7.6: Metals, Nonmetals, and Metalloids – Chemistry LibreTexts
7: Periodic Properties of the Elements

https://chem.libretexts.org/Courses/Mount_Royal_University/Chem_1201/Unit_2._Periodic_Properties_of_the_Elements/2.11:_Metals_Nonmetals_and_Metalloids

https://chem.libretexts.org/Courses/Mount_Royal_University/Chem_1201/Unit_2._Periodic_Properties_of_the_Elements/2.11:_Metals_Nonmetals_and_Metalloids
2.11: Metals, Nonmetals, and Metalloids – Chemistry LibreTexts
Chem 1201 Unit 2: Periodic Properties of the Elements
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