Atomic NumberAtomic Number of Selenium
Atomic Number of Selenium is 34.
Chemical symbol for Selenium is Se. Number of protons in Selenium is 34. Atomic weight of Selenium is 78.971 u or g/mol. Melting point of Selenium is 217 °C and its the boiling point is 685 °C.
» Boiling Point » Melting Point » Abundant » State at STP » Discovery YearAbout Selenium
This chemical element can be found in two forms: a red color powder or light grey color metal. Selenium has a beautiful name coming after the Greek name for the Moon. This element is vital for living creatures and things, but just in micro doses, and in excess doses it can cause cancer or serious intoxication. Selenium in its pure form can not be found on the surface of our planet, but it exists in some rare minerals and special muds. The most important use of this chemical element is in glass production. It can be also added as catalyst and as electricity convertor in rectifiers.
Properties of Selenium Element
| Atomic Number (Z) | 34 |
|---|---|
| Atomic Symbol | Se |
| Group | 16 |
| Period | 4 |
| Atomic Weight | 78.971 u |
| Density | 4.809 g/cm3 |
| Melting Point (K) | 453 K |
| Melting Point (℃) | 217 °C |
| Boiling Point (K) | 958 K |
| Boiling Point (℃) | 685 °C |
| Heat Capacity | 0.321 J/g · K |
| Abundance | 0.05 mg/kg |
| State at STP | Solid |
| Occurrence | Primordial |
| Description | Non-metal |
| Electronegativity (Pauling) χ | 2.55 |
| Ionization Energy (eV) | 9.75238 |
| Atomic Radius | 115pm |
| Covalent Radius | 116pm |
| Van der Waals Radius | 190 |
| Valence Electrons | 6 |
| Year of Discovery | 1817 |
| Discoverer | Berzelius |