Berilio

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Beryllium
4Be
-

Be

Mg
lithiumberylliumboron
Appearance
white-gray metallic
General properties
Name, simbolo, kaiphan beryllium, Be, 4
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw
Group, period, block 22, s
Standard atomic weight 9.012182(3)
Electron configuration [He] 2s2
2, 2
Electron shells of beryllium (2, 2)
History
Discovery Louis Nicolas Vauquelin (1797)
First isolation Friedrich Wöhler & Antoine Bussy (1828)
Physical properties
Phase magahi
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[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
Beryllium has a hexagonal crystal structure
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[2] 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 -
9Be 100% 9Be is stable with 5 neutrons
10Be trace 1.36×106 y β 0.556 10B
t  h  u
· r

Ang berilio (Iningles beryllium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Be ug kaiphan nga atomik 4. Ang berilio mao ang puthaw.

Ang mga gi basihan niini[usba | edit source]

  1. Beryllium: Beryllium(I) Hydride compound data. bernath.uwaterloo.ca. Retrieved on 2007-12-10.
  2. Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. p. 14-39. ISBN 0-8493-0486-5. 


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