Atomic Number of Selenium

Selenium Atomic Number

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 Year

About 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 SymbolSe
Atomic Weight78.971 u
Density4.809 g/cm3
Melting Point (K)453 K
Melting Point (℃)217 °C
Boiling Point (K)958 K
Boiling Point (℃)685 °C
Heat Capacity0.321 J/g · K
Abundance0.05 mg/kg
State at STPSolid
Electronegativity (Pauling) χ2.55
Ionization Energy (eV)9.75238
Atomic Radius115pm
Covalent Radius116pm
Van der Waals Radius190
Valence Electrons6
Year of Discovery1817

What is the Boiling Point of Selenium?

Selenium boiling point is 685 °C. Boiling point of Selenium in Kelvin is 958 K.

What is the Melting Point of Selenium?

Selenium melting point is 217 °C. Melting point of Selenium in Kelvin is 453 K.

How Abundant is Selenium?

Abundant value of Selenium is 0.05 mg/kg.

What is the State of Selenium at Standard Temperature and Pressure (STP)?

State of Selenium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Selenium Discovered?

Selenium was discovered in 1817.

Please Share Your Comments