Beryllium (Be): Atomic number: 4, Atomic mass: 9.01218 g.mol -1, Electronegativity: 1.5, Density: 1.86 g.cm-3, Melting point: 1280 °C, Boiling point: 2970 °C, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 1, Electronic shell: 1s2 2s2 or [ He ] 2s2, Energy of first ionisation: 899.2 kJ.mol -1, Energy of second ionisation: 1757 kJ.mol -1, Standard potential: - 1.70 V, Discovered by: Abbé René-Just Hauy in 1798. Beryllium is a toxic bivalent element, steel gray, strong, light-weight, primarily used as hardening agent in alloys. Beryllium has one of the highest melting points of the light metals. It has excellent thermal conductivity, is nonmagnetic, it resists attack by concentrated nitric acid and at standard temperature and pressures beryllium resist oxidation when exposts to air. Applications: Beryllium is used as an alloying agent in the production of beryllium-copper. Thanks to their electrical and thermal conductivity, high strenght and hardness, non magnetic properties, good resistance, dimensional stability over a wide temperature range beryllium-copper alloys are used in many applications. A typical application of beryllium-copper alloys is in the defense and aerospace industries. Beryllium is also used in the field of X-ray detection diagnostic (it is transparent to X-rays) and in the making of various computer equipment. Beryllium in the environment: The beryllium content on Earth crust is 2.6 ppm, in soil 6 ppm. Beryllium in soil can pass into the plants grown on it, provided it in a soluble form. Typical levels in plants vary between 1 and 40 ppb, too low to affect animals which eat these plants. Beryllium is found in 30 different minerals, the most important of which are bertrandite, beryl, chrysoberyl, and phenacite. Precious forms of beryl are aquamarine and emerald.

 

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Beryllium (Be): Atomic number: 4, Atomic mass: 9.01218 g.mol -1, Electronegativity: 1.5, Density: 1.86 g.cm-3, Melting point: 1280 °C, Boiling point: 2970 °C, Vanderwaals radius: unknown, Ionic radius: unkn . . . View Full Definition

Beryllium: (Be) Element 4, atomic weight 9.0122, an extremely toxic metal used as a neutron source and in phosphors.

Alkaline Earth Metal: The Group 2 elements, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) form alkaline oxides and hydroxides and are called 'alkaline earth metals'.