SELENIUM, Se (34)

HYDROGEN TO OGANESSON

ATOMIC ARCHITECTURE

Spectrograph
Elemental Tile
Selenium from Selenite
CDC Logo

Selenium

Se (34)

sɪˈliːniəm

PHONETICS

Selenium is a non-metal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. It rarely occurs in its elemental state in nature, or as pure ore compounds.

ELEMENT BRIEF

1817 by Jöns Berzelius, Sweden.

DISCOVERY

Ancient Greek, Σελήνη (Selḗnē, 'moon').

ETYMOLOGY

Selenium

ELEMENT

Se

SYMBOL

34

ATOMIC NUMBER

7782-49-2

CAS NUMBER

element

ELEMENTAL SPECTRUM


Grey

ELEMENTAL COLOUR


1.000'895

REFRACTIVE INDEX


0.330

POISSON RATIO


16.385 cm³

MOLAR VOLUME


736.00M Pa, 7.263'8k Atm

BRINELL HARDNESS


2.00

MOHS HARDNESS


-

VICKERS HARDNESS


3,350 m/s, Mach 9.766'8

SPEED OF SOUND


8.30G Pa, 81.914'6k Atm

BULK MODULUS


3.70G Pa, 36.516'2k Atm

SHEAR MODULUS


10.00G Pa, 98.692'3k Atm

YOUNG MODULUS


ALLOTROPES

element element element element
element element element element
element element element

494.15 K, 221.00 °C

MELTING POINT


958.15 K, 685.00 °C

BOILING POINT


-

AUTOMATIC IGNITION


-

FLASHPOINT


1,766.00 K, 1,492.85 °C

CRITICAL TEMPERATURE


27.20M Pa, 268 Atm

CRITICAL PRESSURE


0.520'000 W/(m K)

THERMAL CONDUCTIVITY


-

THERMAL EXPANSION


321.20 J/(kg K)

SPECIFIC HEAT


5.400 kJ/mol

HEAT FUSION


26.000 kJ/mol

HEAT VAPORISATION


-

HEAT COMBUSTION


-

CURIE POINT


-

NEEL POINT


-

ADIABATIC INDEX


Solid

PHASE


-

ELECTRICAL TYPE


-

CONDUCTIVITY


-

RESISTIVITY


-

SUPERCONDUCTING POINT


Diamagnetic

MAGNETIC TYPE


-0.000'000'004'0

MASS SUSCEPTIBILITY


-0.000'000'000'316'00

MOLAR SUSCEPTIBILITY


-0.000'019'300'00

VOLUME SUSCEPTIBILITY


Non Metal

CLASSIFICATION


78.959'388'2

ATOMIC WEIGHT


103 pm

ATOMIC RADIUS


116 pm

COVALENT RADIUS SINGLE BOND


107 pm

COVALENT RADIUS DOUBLE BOND


102

COVALENT RADIUS TRIPLE BOND


190 pm

VAN DER WAALS RADIUS


[Ar]4s²3d¹⁰4p⁴

ELECTRON CONFIGURATION


Hexagonal, Primitive

CRYSTAL STRUCTURE


4.819'00 g/cm³

DENSITY AS SOLID


3.990'00 g/cm³

DENSITY AS LIQUID


-

DENSITY AS GAS


P12₁/C1

SPACE GROUP NAME


14

SPACE GROUP NUMBER


π/2, 1.584'93 π/2

LATTICE ANGLES


905.4, 908.3 1160.1 pm

LATTICE CONSTANTS


6

VALENCE


2.55

ELECTRONEGATIVITY


194.97 kJ/mol

ELECTRON AFFINITY


IONISATION ENERGY

element element element element
element element element

0.000'003 %

UNIVERSE


0.001'3 %

METEORITES


-

SUN


0.000'005 %

EARTH CRUST


0.000'000'045 %

OCEANS


0.000'005 %

HUMANS


Stable

HALF LIFE


Stable

LIFETIME


4p⁴ = 4, 1, -1, -1/2

QUANTUM NUMBERS


8.300'00 b σs

NEUTRON CROSS SECTION


11.700'00 b σa

NEUTRON MASS ABSORPTION


STABLE ISOTOPES

element element element element
element

UNSTABLE ISOTOPES

element element element element
element element element element
element element element element
element element element element
element element element element
element element element element
element

ISOTOPIC CHAIN


CENTRALDATACORE

SHARE