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Template:Infobox beryllium - Wikipedia, the free encyclopedia

Template:Infobox beryllium

From Wikipedia, the free encyclopedia

4 lithiumberylliumboron
-

Be

Mg
General
Name, Symbol, Number beryllium, Be, 4
Chemical series alkaline earth metals
Group, Period, Block 22, 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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