Template:Infobox beryllium

lithium ← beryllium → boron - ↑ Be ↓ Mg 4Be Periodic table
Appearance
white-gray metallic
General properties
Name, symbol, number	beryllium, Be, 4
Pronunciation	/bəˈrɪliəm/ bə-RIL-ee-əm
Element category	alkaline earth metal
Group, period, block	2, 2, s
Standard atomic weight	9.012182(3)
Electron configuration	1s2 2s2
Electrons per shell	2, 2 (Image)
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	12.2 kJ·mol−1
Heat of vaporization	297 kJ·mol−1
Molar heat capacity	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
Oxidation states	2, 1 (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	112 pm
Covalent radius	96±3 pm
Van der Waals radius	153 pm
Miscellanea
Crystal structure	hexagonal
Magnetic ordering	diamagnetic
Electrical resistivity	(20 °C) 36 nΩ·m
Thermal conductivity	200 W·m−1·K−1
Thermal expansion	(25 °C) 11.3 µm·m−1·K−1
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
Most stable isotopes
Main article: Isotopes of beryllium
iso NA half-life DM DE (MeV) DP 7Be trace 53.12 d ε 0.862 7Li γ 0.477 - 8Be trace 7×10−17s α 4He 9Be 100% 9Be is stable with 5 neutrons 10Be trace 1.36×106 y β− 0.556 10B

References

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