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Selenium occurs naturally in a number of inorganic forms, including selenide, selenate, and selenite. In soils, selenium most often occurs in soluble forms such as selenate (analogous to sulfate), which are leached into rivers very easily by runoff.
Selenium has a biological role, and it is found in organic compounds such as dimethyl selenide, selenomethionine, selenocysteine, and methylselenocysteine. In these compounds, selenium plays a role analogous to that of sulfur.
Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, silver, or lead. It is obtained as a byproduct of the processing of these ores, from the anode mud of copper refineries and the mud from the lead chambers of sulfuric acid plants. These muds can be processed by a number of means to obtain free selenium.
Natural sources of selenium include certain selenium-rich soils, and selenium that has been bioconcentrated by certain plants. Anthropogenic sources of selenium include coal burning and the mining and smelting of sulfide ores. (Source wikipedia)
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Is technetium found in a compound or pure elemental form?
Technetium is found in both in a compound and pure forms
Can helium be found in its pure Elemental form in nature or is it so reactive that it is only found in compounds?
Helium has completely filled orbitals. hence it is chemically inert (non reactive) and is found in its pure elemental form.
Is selenium powder a pure substance?
Selenium is a pure chemical element.
How do you make selenium sulfide?
Selenium is an element it was "made" in the nova of an exploding star several billion years ago.Selenium is found on Earth in minerals such as pyrites where it partially replaces the sulfides. Native selenium is very rare. Most elemental selenium on the market comes as a byproduct of metal refining such as copper or the production of sulfuric acid.
What naturally occurring elements or compounds found in rocks soil water are called?
The term is "minerals." Few elements are found in their pure elemental form, and they are mostly metals.
Is technetium found in a compound or pure elemental form?
Technetium is found in both in a compound and pure forms
Is boron found usually in a compound or in pure elemental form?
It is a compound
Is calcium usually found in a compound or a pure element?
Calcium is never found in its elemental form in nature.
Is Titanium found usually in pure or compound elemental form?
In nature, titanium is always found as a compound, not as a pure metal. Titanium is highly reactive (although less reactive alloys can be made from it).
What is a common compound found that includes helium?
Helium does not combine with other elements and pure helium will exist by itself as elemental helium.
What are the substances found in selenium?
Selenium is a chemical element. It can be said to be a pure substance; there is nothing else found in it.
Is lead in compound or in pure elemental form?
Lead is an element. But both an elements and compounds are pure substances.
Is chlorine from the periodic table found in a pool?
In small quantities. "Chlorine" for pools is actually a chlorine-containing compound, not pure elemental chlorine. Sodium hypochlorite (household bleach) is one such compound.
Can helium be found it its pure elemental form?
Yes. helium is found in its elemental form. it is chemically inert as it has completely filled orbitals.
Can helium be found in its pure Elemental form in nature or is it so reactive that it is only found in compounds?
Helium has completely filled orbitals. hence it is chemically inert (non reactive) and is found in its pure elemental form.
Is KF a ionic compound or a pure covalent compound?
K is an element. It is elemental Potassium metal.
Is selenium powder a pure substance?
Selenium is a pure chemical element.
