Selenium is a nutritionally essential element. People need selenium for healthy joints, heart and eyes. It plays a critical role in DNA synthesis, the immune system and the reproductive system. It also helps fight cancer and other diseases.
The crystalline (metallic) form of selenium has a melting point of217°C (423°F ) and a boiling point of 685°C (1,260°F). Its density is 4.5 grams per cubic centimeter. Selenium from the Greek word for moon, selene . Some of the most important physical characteristics of selenium are its electrical properties.
Additionally, why is selenium named after the moon? It was Berzelius who discovered selenium in 1817, as an impurity in sulphuric acid. Tellurium had already been discovered, and named after the Greek word for earth, so he named selenium using the Greek word for moon, selene.
Also, what is the malleability of selenium?
4.809 g/cm3. Standard/Natural state at room temperature (solid/liquid/gas) Solid. Malleability. Yes.
Who was Selenium discovered by?
Johan Gottlieb Gahn Jöns Jacob Berzelius
What are 3 uses for selenium?
Uses of Selenium Selenium is used in the glass industry to decolorize glass and to make red-colored glasses and enamels. It is used as a catalyst in many chemical reactions. Selenium is used in solar cells and photocells – in fact the first solar cell was made using selenium. It is also used as a photographic toner.
Where is selenium found in nature?
SE-LE-NI-UM While rare, selenium is normally found in minerals. Of the lesser members in the sulfur family, selenium is the most abundant in nature, often found in copper and lead mining. Tellurium and polonium are other members in the same family (and found in the same column of the periodic table).
What state of matter is selenium?
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Selenium is classified as an element in the ‘Non-Metals’ section which can be located in groups 14,15 and 16 of the Periodic Table.
Is there selenium on the moon?
Selenium – from Ancient Greek σελήνη (sel?nē) “Moon” – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium (named for the Earth). Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production.
What is selenium mainly used for?
Selenium is a framework to conduct software testing. It is used mostly to test web applications. With selenium there is no need to write testing scripts, the software comes with easy navigation tools that can write test cases without the need for any script.
What is the use of selenium?
Selenium is used to treat or prevent selenium deficiency. Selenium has been used in alternative medicine as an aid to treat Hashimoto’s thyroiditis (an autoimmune disorder of the thyroid), and to treat high cholesterol. Not all uses for selenium have been approved by the FDA.
Is Selenium a good conductor of electricity?
Selenium is a good conductor of electricity in presence of light. This phenomenon is called photoconductivity.
What can Selenium be found in?
Selenium is found in many different foods. Seafood and organ meats are the richest sources, according to the National Institutes of Health (NIH). Other foods that have selenium include muscle meats, grains and dairy products. It can also be found in drinking water in some places.
What is the history of selenium?
History and Uses: Selenium was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1817 after analyzing an impurity that was contaminating the sulfuric acid (H2SO4) being produced at a particular factory in Sweden. Selenium can also produce electricity directly from sunlight and is used in solar cells.
Is Selenium a metalloid?
Selenium (Se), a chemical element in the oxygen group (Group 16 [VIa] of the periodic table), closely allied in chemical and physical properties with the elements sulfur and tellurium. Selenium is a metalloid (an element intermediate in properties between the metals and the nonmetals).
What state of matter is bromine?
Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.
What state of matter is tellurium?
The Atomic Number of this element is 52 and the Element Symbol is Te. Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. Tellurium is classified as a “Metalloid” element and is located in Groups 13, 14,15, 16 and 17 of the Periodic Table.
What is the charge of selenium?
It would be easier for the element to become stable by accepting 2 electrons rather than donating 6 of its electrons. This suggests that the charge of the selenium ion must be −2 to undergo an ionic bond. Therefore, the charge on the ion that selenium forms in an ionic compound is −2 .
Is gold on the periodic table?
The element gold. Gold is element 79 and its symbol is Au. Though the name is Anglo Saxon, gold originated from the Latin Aurum, or shining dawn, and previously from the Greek. Gold along with silver and copper, form a column in the periodic table.