Beryllium

Symbol BeAtomic number 4
Atomic mass
9.01218
 Thermal conductivity
2.00
Atomic radius
1.40
 Covalent radius
0.90
Density
1.85
 Atomic volume
5.0
Melting point
1551
 Oxidation states
2
Boiling point
3243
 Stable isotopes
1
Heat of vapor.
292.4
 Electronegativity
1.57
Heat of fusion
12.2
 First ionization
9.322
Specific heat
1.82
 Electrical conduct.
...
Electron configuration

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Beryllium

Beryllium is a light, silvery-white metal. It is used for making windows for x-ray tubes and radiation counters. X-rays readily penetrate materials of low atomic number, and beryllium metal has the best mechanical properties for the production of such windows.

Beryllium is also used in specialty alloys. About 2% of beryllium in copper produces a hard alloy used for making springs.

The principal ore of beryllium is beryl, Be3Al2(SiO3)6. Gem varieties of beryl include emerald, which is beryl with traces of chromium to contribute the green color. Aquamarine is also a bluegreen variety of beryl.

Compounds of beryllium are very poisonous - dust or powder from the metal or its oxides can cause serious illness.


Atomic dataNuclear data
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Chemistry concepts

Reference
Pauling
Ch. 26
 
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Beryllium Nuclear Data

Z
A
Atomic
Mass (u)
Nuclear
Mass(GeV/c2
Binding
Energy(MeV)
Spin
Natural
Abund.
Half-life
Decay
Q
MeV
4
7
7.016928
6.5342
37.6
3/2
...
53.28d
EC
0.86
4
9
9.012182
8.3928
58.17
3/2
100
stable
...
...
4
10
10.013534
9.3256
64.98
0
...
1.52My
b-
0.56
4
11
11.021658
10.2646
65.48
1/2
...
13.8s
b-
11.48
4
12
12.026921
11.2011
68.65
0
...
24ms
b-
11.71
Atomic data
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Reference
Rohlf
 
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