Selenium

Oxidation number of Se is +6. Oxidation number of O is -2.

Two- Since it has six valence electrons, it can form two covalent bonds, making the valence two. If it is easier to think about it this way, eight valence electrons would stabilize the element. Eight minus six is two, giving us the same answer as before.

Barium Selenide ---> Ba2+Se2- ---> BaSe

Plant foods are the major sources of selenium. Brazil nuts are the best natural source (100 grams of nuts provide about 1917 µg of selenium and 3,485% of recommended daily intake). NOTE: You should eat no more than one Brazil nut per day because of their very high selenium content, which can cause toxicity if you eat too much.

Other good sources include sunflower seeds, macaroni, crimini mushrooms, and whole grains.

The content of selenium in food depends on the selenium content of the soil where plants are grown. For example, soils in the high plains of northern Nebraska and the Dakotas have very high levels of selenium, while soils in some parts of China and Russia have very low amounts of selenium. Likewise, the selenium content of foods can vary. For example, the U.S. Department of Agriculture Food Composition Database lists the selenium content of Brazil nuts as 544 mcg of selenium per ounce, but values from other analyses vary widely.

Catechol is a compound with a benzene ring and two hydroxyl groups. It is found in various plants, such as Arisaema species, where it acts as a defense mechanism against herbivores. Catechol is also a common building block in the synthesis of various pharmaceuticals and chemicals.

Selenium is more reactive than sulfur because it has a lower ionization energy and higher electronegativity, making it more readily form bonds with other elements. Additionally, its larger atomic size allows for easier electron transfer, enhancing its reactivity compared to sulfur.

A selenium atom typically contains 34 electrons distributed in different shells around the nucleus. The electrons are arranged in energy levels or shells, with the first shell holding a maximum of 2 electrons, the second shell holding up to 8 electrons, the third shell holding up to 18 electrons, and the fourth shell holding up to 6 electrons for selenium.

a metallic taste in the mouth, garlic-like breath odor, dizziness, nausea , skin inflammation, fatigue , and the loss of hair or nails. The symptoms of acute selenium poisoning include fever , kidney and liver damage, and eventual death.

Selenium is used in naturopathy as a powerful antioxidant that helps protect cells from damage caused by free radicals. It is also important for thyroid function and supports immune system health. Selenium supplementation may be recommended for conditions like Hashimoto's thyroiditis or to support overall health and well-being.

Selenium is widely available in vitamin/mineral dietary supplements and in nutritional antioxidant formulas. Although the average diet supplies enough selenium, some naturopaths recommend daily supplements

Selenium does not directly interact with light. However, selenium is used in the production of photocells, which convert light energy into electrical energy. Selenium can also be used in some photovoltaic applications to generate electricity from sunlight.

Oxygen is less dense than selenium. Oxygen has a density of about 1.43 grams per cubic centimeter, while selenium has a density of about 4.81 grams per cubic centimeter.

Selenium has six naturally occurring isotopes, five of which are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. The last three also occur as fission products, along with 79Se, which has a half-life of 327,000 years.

The final naturally occurring isotope, 82Se, has a very long half-life (~1020 yr, decaying via double beta decay to 82Kr), which, for practical purposes, can be considered to be stable.

Twenty-three other unstable isotopes have been characterized

In the past, selenium was mainly used in the production of glass to remove color caused by impurities and to make glass more transparent. It was also employed in photographic paper to increase sensitivity to light. Additionally, selenium was used in early electronics as a rectifying agent in devices like rectifiers and photovoltaic cells.

Selenium: [Ar] 3d10 4s2 4p4 or 2, 8, 18, 6

Phosphorus: [Ar] 3d10 4s2 4p3 or 2, 8, 18, 5

Selenium is primarily obtained as a byproduct of copper refining, and its main mining locations are in Russia, Canada, China, and the United States. Other sources include Japan, Germany, and Belgium.

While selenium is an essential mineral that supports overall health and has antioxidant properties that can help reduce inflammation, it is not a cure for periodontal disease. Proper oral hygiene practices, professional dental cleanings, and treatments prescribed by a dentist are essential for managing and treating periodontal disease effectively.

I am not aware of a specific company that re-coats selenium onto a cylindrical drum, as this process is not commonly done due to the toxicity and health risks associated with selenium. It is more common to replace the drum or find alternative solutions.

A selenium camera is a type of light metering system that uses a selenium cell to measure the amount of light available for a photograph. It is commonly found in older film cameras and works by converting light into an electrical current which helps to determine the optimal exposure settings for a photo.

Selenium has 34 protons, 34 electrons, and its most common isotope has 45 neutrons, which gives it a mass number of approximately 79. The number of each subatomic particle can vary slightly depending on the specific isotope of selenium.

Oxygen is more reactive than selenium. Oxygen is a highly reactive element that readily forms compounds with other elements, while selenium is less reactive in comparison. Oxygen's reactivity is evident in its ability to support combustion and oxidation reactions, whereas selenium's reactivity is more limited due to its position in the periodic table.

One Brazil nut contains approximately 68-91 micrograms of selenium, depending on the size of the nut. This is significantly higher than the recommended daily intake of selenium for adults, which is around 55 micrograms.

There is no evidence that taking tablets containing selenium and zinc would directly increase heart rate. However, excessive intake of these minerals may lead to adverse effects on heart health, so it's important to stay within recommended daily limits and consult a healthcare provider before taking any supplements.

They are all chemical elements in Group 16 of the periodic table.

The atomic number of each element (number of protons in an atom) is:

oxygen 8

sulfur 16

selenium 34

tellurium 52

When disposing of selenium, it is important to follow regulations set by local environmental agencies. This often involves recycling selenium-containing materials, such as used electronic devices or batteries, at designated facilities to prevent environmental contamination. Improper disposal can lead to selenium leaching into soil and water sources, posing a risk to human and ecosystem health.