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Beryllium

Symbol Be
Atomic Number 4
Atomic Weight 9.0122 g/mol
Density 1.848 g/cm³
Melting Point 1,278 °C (2,352 °F)
Boiling Point 2,470 °C (4,478 °F)
Crystal Structure Hexagonal (close-packed)
Color Steel gray
Hardness 5.5 (Mohs scale)
Electrical Conductivity 29.8 x 10⁶ S/m (at 20°C)
Thermal Conductivity 200 W/m·K
Young's Modulus 287 GPa
Thermal Expansion 11.5 µm/m·K
Specific Heat 1.825 J/g·K
Refractive Index 1.56
Appearance Shiny, brittle metal