4Be9.01218
Béryllium
Alkaline earth metalsBlock sPeriod 2Group 2solid at 20 °C
Configuration :[He] 2s²
Atomic mass :9.0121831 u
English :Beryllium
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Modèle de Bohr · pédagogique
Electron configuration
Full1s² 2s²
Short[He] 2s²
Valence electrons2
KLMNOPQ shells
K2
L2
Electronegativity
Pauling1.57
Allen1.576
Mulliken (eV)—
Atomic radii
Empirical105 pm
Calculated112 pm
Covalent96 pm
Van der Waals153 pm
Ionic radii (Shannon-Prewitt)
+245 pm
Successive ionisation energies
I₁899.5 kJ/mol
I₂1757.1 kJ/mol
I₃14848.7 kJ/mol
I₄21006.6 kJ/mol
Electron affinity—
Oxidation states
+1+2
Bold states = most common.