Sélénium
Block pPeriod 4Group 16solid at 20 °C
Configuration :[Ar] 3d¹⁰ 4s² 4p⁴
Atomic mass :78.971 u
English :Selenium
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Modèle de Bohr · pédagogique
Electron configuration
Full1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴
Short[Ar] 3d¹⁰ 4s² 4p⁴
Valence electrons6
KLMNOPQ shells
K2
L8
M18
N6
Electronegativity
Pauling2.55
Allen2.424
Mulliken (eV)—
Atomic radii
Empirical115 pm
Calculated103 pm
Covalent120 pm
Van der Waals190 pm
Ionic radii (Shannon-Prewitt)
-2198 pm
Successive ionisation energies
I₁941 kJ/mol
I₂2045 kJ/mol
I₃2973.7 kJ/mol
I₄4144 kJ/mol
I₅6590 kJ/mol
Electron affinity195 kJ/mol
Oxidation states
-2-1+1+2+3+4+5+6
Bold states = most common.