Selenium (symbol Se) is element number 34 of the periodic table and belongs to the “Nonmetal” category. Its atomic mass is about 78.96, and its phase under standard conditions is Solid. This element sits in period 4 and group 16 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 6. The short electron configuration of Selenium is [Ar] 3d¹⁰ 4s² 4p⁴. Known uses of Selenium include Solar cells, Photocopying and Glassmaking.
The electron configuration of Selenium (Se), with 34 electrons, is shown below. The last shell (shell 4) is highlighted:
Distribution of 34 electrons of Selenium across shells K to N:
The nonmetals are usually poor conductors of heat and electricity and are brittle in solid form; they are the base elements of organic and biological chemistry.
The atomic number of Selenium (Se) is 34; that is, every atom of it has 34 protons.
The electron configuration of Selenium (Se) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴; in short form it is [Ar] 3d¹⁰ 4s² 4p⁴, and its last shell is 4s² 4p⁴.
The chemical symbol of Selenium is Se.
Selenium is located in period 4 and group 16 and belongs to the “Nonmetal” category.
The atomic mass of Selenium is about 78.96 (atomic mass units).
The phase of Selenium under standard conditions is Solid.
Uses of Selenium include Solar cells, Photocopying and Glassmaking.
Selenium was discovered by Jöns Jacob Berzelius in 1817.
Hydrogen (H)Carbon (C)Nitrogen (N)Oxygen (O)Phosphorus (P)Sulfur (S)
Oxygen (O)Sulfur (S)Tellurium (Te)Polonium (Po)Livermorium (Lv)
