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A nonmetallic element of the sulphur group, and analogous to sulphur in its compounds. It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.9.
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What is the valence electron configuration of selenium?
The valence electron configuration of selenium is 4s2 4p4, meaning it has 6 valence electrons.
What happens when selenium is exposed to light?
Selenium is photoconductive, meaning its electrical conductivity increases when exposed to light. This property is used in applications such as photocopiers and solar cells. However, prolonged exposure to bright light can degrade selenium's performance.
What element name comes from the goddess of the moon?
Selenium is derived from 'Selene', meaning moon.
Where did the chemical symbol for 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 S1. Tellurium (from Latin tellus, meaning "Earth") and with2. 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).
How many valence electron have selenium?
6. If you look at the electron configuration of Selenium, it is [Ar]3d^10 4s^2 4p^4, meaning 10 electrons are located in the 3rd shell, and a total of 6 are located in the 4th shell, the highest energy shell. The electrons in the 4s and 4p shells combined are the valence electrons, meaning there are 6 valence electrons on Selenium.
What is the correct name for SeF6?
This compound is called selenium hexafluoride.
How many moles of selenium in selenium tetra-fluoride?
There is one mole of selenium in one mole of selenium tetrafluoride, as the formula for selenium tetrafluoride is SeF4. Therefore, there is 1 mole of selenium in 1 mole of selenium tetrafluoride.
How many electrons are gained or lost when selenium forms an ion?
Since Selenium is a Chalcogen (meaning it's in group 6A on the Periodic Table), it gains 2 electrons to form an ion with a charge of -2.
Is selenium a nonmetal?
Yes. selenium is a non metal
Who made Selenium?
Jons Jacob was the man to discover Selenium.
What is selenium chemical symbol?
Se is the symbol for Selenium.
What are selenium helium and tellurium named after?
Tellurium - Tellus, which is latin for earth. Helium - Helios, meaning the sun. Selenium- Selene, which is Greke for moon.
