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BeH 2 is usually formed as an amorphous white solid, but a hexagonal crystalline form with a higher density (~0.78 g/cm 3) was reported, [7] prepared by heating amorphous BeH 2 under pressure, with 0.5-2.5% LiH as a catalyst. Subunit of structure of BeH 2. Each Be is tetrahedral and each H is doubly bridging. [8]
The propensity for any two substances to form a solid solution is a complicated matter involving the chemical, crystallographic, and quantum properties of the substances in question. Substitutional solid solutions, in accordance with the Hume-Rothery rules, may form if the solute and solvent have: Similar atomic radii (15% or less difference)
At low temperatures, the electrons of solid materials can also organize into various electronic phases of matter, such as the superconducting state, with vanishing resistivity. Magnetic states such as ferromagnetism and antiferromagnetism can also be regarded as phases of matter in which the electronic and nuclear spins organize into different ...
Beryllium fluoride has distinctive optical properties. In the form of fluoroberyllate glass, it has the lowest refractive index for a solid at room temperature of 1.275. Its dispersive power is the lowest for a solid at 0.0093, and the nonlinear coefficient is also the lowest at 2 × 10 −14.
A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M(H 2 O) n] z+.The solvation number, n, determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table.
Only Be and Mg form nitrides directly. 3Be + N 2 → Be 3 N 2 3Mg + N 2 → Mg 3 N 2. Reaction with hydrogen. Alkaline earth metals react with hydrogen to generate saline hydride that are unstable in water. Ca + H 2 → CaH 2. Reaction with water. Ca, Sr, and Ba readily react with water to form hydroxide and hydrogen gas.
The term phase is sometimes used as a synonym for state of matter, but it is possible for a single compound to form different phases that are in the same state of matter. For example, ice is the solid state of water, but there are multiple phases of ice with different crystal structures, which are formed at different pressures and temperatures.
The linear shape contrasts with the monomeric forms of some of the dihalides of the heavier members of group 2, e.g. CaF 2, SrF 2, BaF 2, SrCl 2, BaCl 2, BaBr 2, and BaI 2, which are all non-linear. [5] Beryllium chloride dissolves to give tetrahedral [Be(OH 2) 4] 2+ ion in aqueous solutions as confirmed by vibrational spectroscopy. [6]