Periodic Table of Elements showing Selenium nonmetal elements

Selenium

Element	Selenium
Symbol	Se
Atomic Number	34
Molar Mass	78.96 gmol^-1
Electron Configuration	[Ar]3d¹⁰4s²4p⁴
Normal State	solid nonmetal
Density @STP	4.81 g cm^-3
Melting Point	221^oC
Boiling Point	685^oC
Stable Isotopes	⁷⁴Se, ⁷⁶Se, ⁷⁷Se, ⁷⁸Se, ⁸⁰Se, ⁸²Se
Atomic Radius	117 pm
Ionic Radius	198 (2-) pm
Electronegativity (Pauling)	2.55
Ionization Energy (1^st)	941 kJ mol^-1
Ionization Energy (2^nd)	2044 kJ mol^-1
Ionization Energy (3^rd)	2974 kJ mol^-1
Molar Heat Capacity	25.4 J K^-1mol^-1
Standard Molar Entropy	42.4 J K^-1mol^-1
Enthalpy of Fusion	5.1 kJ mol^-1
Enthalpy of Vapourization	26.32 kJ mol^-1

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Selenium is silvery metallic or as a red powder nonmetal element
Selenium discovered and first isolated by Jöns Jakob Berzelius and Johann Gottlieb Gahn (1817)
Selenium named after Selene, Greek goddess of the moon
Selenium forms several allotropes that interconvert with temperature changes
Selenium is found in a few rare minerals. Most selenium is obtained from the anode muds produced during the electrolytic refining of copper
Selenium is used in production of glass to control colour
Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination)
Selenium is useful in photocells, solar cells, light meters and photocopiers
Selenium can convert AC electricity to DC electricity and used in rectifiers
Selenium is toxic to the scalp fungus that causes dandruff and used in anti-dandruff shampoos
Selenium is used as an additive to make stainless steel.
Selenium is used in the toning of photographic prints
Selenium is silvery metallic or as a red powder nonmetal element
Selenium is an essential trace element for some species and humans, though toxic in large doses

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