Mendeleev's Periodic Table > Be - Beryllium

Be - Beryllium

Beryllium is an alkaline earth metal, many compounds of which are toxic. Discovery of the element in the mineral beryl, was reported by Nicolas Louis Vauquelin in 1789. Beryllium metal was isolated by Wöhler and Bussy in 1828. At ordinary temperatures, beryllium resists oxidation in air. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Aquamarine and emerald are precious forms of the mineral beryl, [Be3Al2(SiO3)6]. An interesting curiosity: the speed of sound in beryllium (12,500 m/s) is greater than in any other element.

Atomic number - 4 Density g/mL 1 .85
Atomic weight u 9 .01218 Melting point K 1560
Bonding radius A 0 .9 Boiling point K 2745
Atomic radius A 1 .4 Heat of vaporization kJ/mol 292 .4
Ionization Potential V 9 .322 Heat of fusion kJ/mol 12 .2
Electronegativity - 1 .57 Specific heat J/gK 1 .82
The oxide is amphoteric. Crystal are hexagonal.
Electron config. : 1s2 2s2

Isotopes of Be (Beryllium):

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 006
92KEV
2p,1.372 MeV
He-4
6.0197263 		007
53.29 da
EC,1.372 MeV
Li-7
7.0169292 		008
6.8EV
2a,16.004 MeV
none
8.0053051 		009 100%

Stable

9.0121822
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 010
1.51E+6 yr
B-,16.775 MeV
B-10
10.013533 		011
13.81 sec
B-/B-a,11.506
B-11/Li-7
11.021657 		012
23.6 msec
B-/B-n,11.708
B-12/B-11
12.026920 		013
0.9 MeV
n,2.010 MeV
Be-12
13.037745
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 014
4.35 msec
B-/B-2n/B-n,16.220
B-14/B-12/B-13
14.042812


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