Template:Infobox beryllium

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4 lithium ← beryllium → boron - ↑ Be ↓ Mg Periodic Table - Extended Periodic Table
General
Name, Symbol, Number	beryllium, Be, 4
Chemical series	alkaline earth metals
Group, Period, Block	2, 2, s
Appearance	white-gray metallic
Atomic mass	9.012182(3) g·mol−1
Electron configuration	1s2 2s2
Electrons per shell	2, 2
Physical properties
Phase	solid
Density (near r.t.)	1.85 g·cm−3
Liquid density at m.p.	1.690 g·cm−3
Melting point	1560 K (1287 °C, 2349 °F)
Boiling point	2742 K (2469 °C, 4476 °F)
Heat of fusion	7.895 kJ·mol−1
Heat of vaporization	297 kJ·mol−1
Heat capacity	(25 °C) 16.443 J·mol−1·K−1
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K 1462 1608 1791 2023 2327 2742
Atomic properties
Crystal structure	hexagonal
Oxidation states	2 (amphoteric oxide)
Electronegativity	1.57 (Pauling scale)
Ionization energies (more)	1st: 899.5 kJ·mol−1
	2nd: 1757.1 kJ·mol−1
	3rd: 14848.7 kJ·mol−1
Atomic radius	105 pm
Atomic radius (calc.)	112 pm
Covalent radius	90 pm
Miscellaneous
Magnetic ordering	diamagnetic
Thermal conductivity	(300 K) 200 W·m−1·K−1
Thermal expansion	(25 °C) 11.3 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 35.6 n m/s
Speed of sound (thin rod)	(r.t.) 12870 m·s−1
Young's modulus	287 GPa
Shear modulus	132 GPa
Bulk modulus	130 GPa
Poisson ratio	0.032
Mohs hardness	5.5
Vickers hardness	1670 MPa
Brinell hardness	600 MPa
CAS registry number	7440-41-7
Selected isotopes
Main article: Isotopes of beryllium iso NA half-life DM DE (MeV) DP 7Be syn 53.12 d ε - 7Li γ 0.477 - 9Be 100% Be is stable with 5 neutrons 10Be trace 1.51×106 y β- 0.556 10B
References
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