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4Be9.012
Beryllium
Alkaline Earth MetalBeryllium is a chemical element with symbol Be and atomic number 4. It is created through stellar nucleosynthesis and is a relatively rare element in the universe. It is a divalent element which occurs naturally only in combination with other elements in minerals.
Phase: SolidAppearance: white-gray metallic
2, 2
Physical Properties
Atomic Mass9.01218315 u
Density1.85 g/cm³
Melting Point1560 K
Boiling Point2742 K
Molar Heat16.443 J/(mol·K)
Period2
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2
Semantic Config[He] 2s2
Shells2, 2
Electron Affinity-48 kJ/mol
Electronegativity1.57
Ionization Energies
IE1: 899.5 kJ/molIE2: 1757.1 kJ/molIE3: 14848.7 kJ/molIE4: 21006.6 kJ/mol
Discovery
Discovered byLouis Nicolas Vauquelin