Selenium

Selenium (Se) is a nonmetal (recognized a metalloid) related to sulfur and is often used in glassmaking. Although it can be toxic, it is needed in trace amounts for proper body function.

1,594 Questions
Selenium

Why is selenium a non metal?

Selenium has no metallic propeties, it isn't shiny, an electrical conductor etc. It forms anions, Se2-.

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Selenium

What disease is caused by lack of selenium?

DIABETES

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Science
Selenium

What period does selenium belong to?

6

umm, its 4. Periods are horizontal lines on the periodic table of elements.

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Selenium

Where does the body store the selenium?

In body proteins

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Biology
Human Anatomy and Physiology
Selenium

How much salt is in the human body?

"The human body contains many salts, of which sodium chloride (AKA common table salt) is the major one, making up around 0.4 per cent of the body's weight at a concentration pretty well equivalent to that in seawater. So a 50kg person would contain around 200g of sodium chloride - around 40 teaspoons. Since we lose salt whenever we sweat, it has to be continually replaced."

Answer 2

All salts present in human or any other animal are in ionic form as salts dissociate in water . Our body contain 1% salts in ionic form . This includes only inorganic salts .

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Selenium

What is a catch phrase for selenium?

Selenium is an element with atomic number 34.

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Selenium

Selenium API testing tool?

no.

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Selenium

How much selenium is safe to consume?

The recommended dietary allowance for selenium is 55 ug per day for bnoth men and woman. The upper limit is 400ug per day. It's a trace mineral so we need very little. Try not to oversupplement as that can lead to toxicity.

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Selenium

When was selenium founded?

Selenium was discovered in 1817 by Jöns Jakob Berzelius

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Selenium

Is selenium ductile?

Selenium tends to be brittle rather than ductile.

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Selenium

How many valence electrons does selenium has?

Six valence electrons

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Chemistry
Atoms and Atomic Structure
Selenium

What is the charge on a stable ion of selenium?

Selenium is two electrons short of having a full valance shell, so a stable ion of selenium will have a 2- charge.

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Science
Elements and Compounds
Atoms and Atomic Structure
Selenium

How many valence electrons does rubidium have?

Rubidium only has one valence electron in its fifth ring. That places it in the first column of the periodic table, and it is a an alkaline metal.

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Alternators
Electronics Engineering
Selenium

How do alternator diodes work?

Diodes allow current to flow in one direction only thus changing the alternating current produced inside the "alternator", to direct current which is required by your car's electrical system.

Think of them as check valves for liquids.

Denis

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Health
Nutrition
Selenium

What is selenium?

Selenium is essential to the immune system and thyroid gland, Selenium is one of the essential trace minerals in the human body. This nutrient is an important part of antioxidant enzymes that protect cells against the effects of free radicals that are produced during normal oxygen metabolism. It is also a rare mineral used in technology.

Selenium was discovered in 1817 by Jöns Jakob Berzelius

Selenium is incorporated into proteins to make selenoproteins that are important antioxidant enzymes. Other selenoproteins help regulate thyroid function and play a role in the immune system. Selenium is an important co-factor for the antioxidant enzyme glutathione-peroxidase, which helps boost the immune system, protect against cardiovascular disease, improve fertility, ward off the growth of cancerous cells, and increase thyroid metabolism. Selenium is also important for detoxification enzymes.

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Selenium

How many protons does an atom of selenium have in its nucleus?

An atom's atomic number tells us the number of protons it has in its nucleus. Checking a periodic table, we see that selenium/'s atomic number is 34. Thus, there are 34 protons in the nucleus of a selenium atom.

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Selenium

What is the formula for selenium dioxide?

SeO2 is the chemical formula for selenium dioxide.

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Selenium

Where did the name selenium come from?

Selenium, Se (from Greek "σελήνη" , selene, meaning "Moon") was discovered in 1817 by Jöns Jakob Berzelius, who found the element associated with Te and S

1. Tellurium (from Latin tellus, meaning "Earth") and with

2. Sulfur (from Sanskrite sulvari, is biblically associated with "hell", -Genesis)

in the process of making sulfuric acid. (source: WikiPedia, 2010-04-02)

Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jakob Berzelius who found the element associated with Tellurium (named for the Earth).

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Vitamins and Supplements
Nutrition
Chemistry
Selenium

What foods are good sources of Unununium?

No food. Unununium (Uuu) Is radioactive & artificial. It is present in 0% in humans. It has also been given a final name: Roentgenium(Rg).

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Selenium

How many neutrons are in selenium?

45

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Science
Chemistry
Elements and Compounds
Selenium

What properties does oxygen share with other elements?

Examples: atomic mass, atomic number, density, reactivity, boiling point, melting point etc.

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Travel & Places
Bridges and Tunnels
Selenium
Iron Man (superhero)

Is the north of the US's landscape mainly man made or nature?

It is a little of both. The north east portion of the US is densely populated while the north central and the north west is mainly open forested areas.

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Geology
Chemistry
Plate Tectonics
Selenium

What percent of abundance of tin is in the earth's crust?

Less than 5%. Surprisingly, oxygen and silicon make up close to 75% of the lithosphere (crust).

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Selenium

Can you replace a selenium rectifier with a silicon rectifier?

The short answer is yes, usually. If you are working with an ultra high voltage stack all bets are off. For old stereos, etc. you need to estimate the peak reverse voltage and the current requirements. If you have documentation, use it, otherwise: rule 1. PIV is 30 volts per plate, divided by the formfactor: rule 1a. Formfactors: diode=1, half bridge (center tap)=2, bridge=4. rule 1b. Use the maximum of the above and the input electrolitic working voltage multiplied by 1.4, then round up to the next standard voltage within reason (silicon is cheap). rule 2. Assume 500mA per square inch of a single plate's area. rule 3. You may need to heatsink the new rectifier, especially if the current is over a few hundred mA. rule 4. Replace the electrolitics!!!! If the unit is old enough to have a selenium, they are well past the warentee. rule 5. If the voltage is low (under 10VDC) you may need to put a small valued resistor between the rectifier and capacitor. example: a 12 plate center tapped rectifier 1.5 inches square; 12*30=360V divide by 2 =180PIV area=2.25 square inches which gives a current requirement of a little over one amp so use a 1.5A 200PIV unit.

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Atoms and Atomic Structure
Chemical Bonding
Selenium

Why does an element lose 4S electrons before 3D electrons?

Because 4s is a lower energy level and 3d is higher. In fact, s levels should, strictly, be written first before d levels when writing electron configurations.

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