Selenium element (Se) is in group 16 and period 4 of a periodic table. Selenium is in the p-block and it is classified as a carbon group element (chalcogens) on the periodic table.
There is a lot more information related to selenium which is mentioned in the Information Table given below.
So let’s dive right into it!
Table of contents
- Selenium element (Information Table)
- Selenium element in Periodic table
- Facts about Selenium
- Properties of Selenium
- Uses of Selenium
Selenium Element (Information Table)
The important data related to selenium element is given in the table below.
|Appearance of selenium||Hexagonal selenium has Metallic gray color |
Monoclinic selenium has Deep red color
|Atomic number of selenium||34|
|Symbol of selenium||Se|
|Atomic mass of selenium||78.971 u|
|Protons, Neutrons & Electrons in selenium||Protons: 34, Neutrons: 45, Electrons: 34|
|State of selenium (at STP)||Solid|
|Group number of selenium in periodic table||16|
|Period number of selenium in periodic table||4|
|Block of selenium in periodic table||p-block|
|Category of selenium||Nonmetals (Chalcogens)|
|Bohr model or Electrons per shell or Electrons arrangement in selenium||2, 8, 18, 6|
|Electron configuration of selenium||[Ar] 3d10 4s2 4p4|
|Orbital diagram of selenium|
|Valence electrons in selenium||6|
|Electronegativity of selenium (on pauling scale)||2.55|
|Atomic radius of selenium (van der Waals radius)||190 picometers|
|Density of selenium||4.82 g/cm3|
|1st ionization energy of selenium||9.752 eV|
|Main isotope of selenium||80Se|
|Melting point of selenium||494 K or 221 °C or 430 °F|
|Boiling point of selenium||958 K or 685 °C or 1265 °F|
|Crystal structure of selenium||Hexagonal|
|Discovery of selenium||By Jöns Jakob Berzelius and Johann Gottlieb Gahn (in 1817)|
Also see: Interactive Periodic Table (It has rotating bohr models as well as many other details of all the 118 elements in a single periodic table).
Selenium element in Periodic table
The Selenium element (Se) has the atomic number 34 and is located in group 16 and period 4. Selenium is a nonmetal and it is classified as a chalcogen element.
Click on above elements in the periodic table to see their information.
Facts about selenium
Here are a few interesting facts about selenium element.
- The name selenium came from the Greek word “Selene”, which means moon.
- Selenium was discovered by Jöns Jakob Berzelius and Johann Gottlieb Gahn in 1817.
- Selenium has different colors as well as different crystal structures.
- The monoclinic selenium has deep red color while the hexagonal selenium has metallic gray color.
- The annual production of selenium in the entire world is around 2000 tons.
- The majority of selenium (around 50% of the total production) is used in the manufacturing of glass.
Properties of selenium
Here is a list of some physical properties and chemical properties of selenium.
Physical properties of selenium
- Selenium is a nonmetal and it has different crystal structures (depending on the temperatures). The monoclinic selenium has brick red color while the hexagonal selenium has metallic gray color.
- Selenium behaves like a semiconductor and hence it is used in photocells.
- Selenium has many isotopes, out of which 80Se is the most abundant.
Chemical properties of selenium
- Selenium reacts with oxygen to form two oxides (SeO2 and SeO3).
- Selenium reacts with halogens like fluorine, chlorine and bromine to form respective selenium halides.
- Selenium reacts with cyanides to form selenocyanates.
Uses of selenium
Here are some uses of the selenium element.
- The major use of selenium (around 50% of total production) is in manufacturing of glass.
- Selenium is also used in making pigments.
- Selenium has the properties of a semiconductor and hence it is also used in photocells.
- Selenium is also used with bismuth in making brasses.
- Selenium is used in copper alloys to improve the machinability of copper alloys.
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