Selenium

The reaction between selenium dioxide and aqueous potassium hydroxide forms selenites, or salts containing the SeO3^2- ion, and water. This reaction can be represented as SeO2 + 2KOH + H2O → K2SeO3 + H2O.

Selenium can combine with a variety of elements, including oxygen, sulfur, hydrogen, and metals such as mercury, copper, and silver. It forms a range of compounds with different properties and applications in industry, biology, and chemistry.

Slenium has 34 protons and 45 neutrons! :)

Mendeleev placed arsenic before selenium in his periodic table based on their atomic weights and chemical properties. Arsenic has a lower atomic weight and exhibits similar chemical behavior to other elements in its group, making it a better match for the position before selenium.

Selenium's mass number is 79. It is the sum of the number of protons and neutrons in the nucleus of a selenium atom.

Selenium (Se) is in oxygen family (group 16 or VIA) and in 4th period.

Selenium has the largest atom among phosphorus, sulfur, and selenium because of its larger atomic radius. This is due to selenium having more electron shells and thus a greater distance from the nucleus.

The balanced chemical equation for the reaction between tartaric acid and copper sulfate is: C4H6O6 + 3CuSO4 -> Cu3(C4H4O6)2 + 3SO4.

Lead used to be commonly added to gasoline as an octane booster, but due to its environmental and health risks, it has been phased out and is no longer used in car gasoline.

1.9 mol Se ( 78.96 grams/1mol Se ) = 150.024 grams

Selenium has a moderate first ionization energy, with a value of 941 kJ/mol. This means that it requires some energy to remove the outermost electron from a selenium atom.

No, selenium is not the only mineral with antioxidant functions. Other minerals such as zinc, copper, manganese, and iron also exhibit antioxidant activity in the body by helping to neutralize harmful free radicals. These minerals play essential roles in protecting cells and tissues from oxidative damage.

The central atom in selenium sulfide has a bent molecular geometry due to the presence of two lone pairs on the selenium atom. This results in a distorted tetrahedral arrangement around the selenium atom.

The abundance of selenium in the atmosphere of Earth is very low, with concentrations typically ranging from 0.1 to 1 nanograms per cubic meter of air. Selenium is not a major component of Earth's atmosphere and is mainly found in soil, water, and food sources.

Selenium typically forms an ion with a charge of -2 when it gains two electrons to achieve a stable electron configuration. This forms the selenide ion (Se2-).

Selenium sulfide, an anti-infective agent, relieves itching and flaking of the scalp and removes the dry, scaly particles that are commonly referred to as dandruff or seborrhea. It is also used to treat tinea versicolor, a fungal infection of the skin.

Selenium exists in several allotropic forms. The most stable, crystalline hexagonal selenium, is metallic gray. Crystalline mono clinic selenium is a deep red color. Amorphous selenium is red in powder form and is black in vitreous form. Gray crystalline 'metallic' selenium conducts electricity better in the light than in the dark (photoconductive) and it can convert light directly into electricity (photovoltaic).

6 but i don't know why though but its six coz it came out for my practice gcse test

Fluorine and selenium can form a type of bond known as a covalent bond, where they share electrons to achieve a stable electron configuration. In this bond, both fluorine and selenium atoms contribute to the bond by sharing electrons rather than transferring them completely.

There is limited data on the prevalence of selenium deficiency in Canada. However, research suggests that certain populations, such as those with specific medical conditions or following restrictive diets, may be at higher risk. It is recommended to consult a healthcare provider for personalized advice on assessing and addressing selenium status.

Selenium deficiency can be diagnosed through blood tests that measure levels of selenium in the body. Symptoms such as muscle weakness, fatigue, and hair loss may also indicate a deficiency.Consulting with a healthcare provider is important for proper diagnosis and treatment.

You should use selenium sulfide 2.25% shampoo as directed by your healthcare provider or as indicated on the product label. In general, it is typically used 2-3 times per week at the beginning of treatment, and then less frequently for maintenance once symptoms improve. It is important to follow the specific instructions provided for your individual situation.

Use for decolourizing of Ferric and Ferrus oxide , green colour to colourless. But Selenium have many oxidation state and can change oxidation state when furnace condition change Reduction to Oxidation.

Selenium, when forming an ion, gains two electrons. The name of the anion is Selenide, and it has a -2 charge. I found this by looking at the periodic table. Find Selenium, number 34, and you can see that two spaces to its right is a noble gas. This means is gains two electrons when forming an ion. I hope I helped.