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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.
The exception is beryllium difluoride. In addition, many transition metal difluorides are water-soluble. Calcium difluoride is a notable compound.
Beryllium difluoride is different from the other difluorides. In general, beryllium has a tendency to bond covalently , much more so than the other alkaline earths and its fluoride is partially covalent (although still more ionic than its other halides).
Beryllium bromide – BeBr 2 [108] Beryllium carbonate – BeCO 3 [109] Beryllium chloride – BeCl 2 [110] Beryllium fluoride – BeF 2 [111] Beryllium hydride – BeH 2 [112] Beryllium hydroxide – Be(OH) 2 [113] Beryllium iodide – BeI 2 [114] Beryllium nitrate – Be(NO 3) 2 [115] Beryllium nitride – Be 3 N 2 [116] [117] Beryllium oxide ...
Molecules of theoretical curiosity such as neon difluoride (NeF 2) and beryllium dilithide (BeLi 2) represent examples of inverted electronegativity. [13] As a result of unusual bonding situation, the donor lone pair ends up with significant electron density on the central atom, while the acceptor is the "out-of-phase" combination of the p ...
beryllium borohydride: 17440–85–6 BeB 2: beryllium boride: 12228–40–9 BeBr 2: beryllium bromide: 7787–46–4 Be(CHO 2) 2: beryllium formate: 1111–71–3 Be(C 2 H 3 O 2) 2: beryllium acetate: 543–81–7 Be(C 5 H 7 O 2) 2: beryllium acetylacetonate: 10210–64–7 BeCl 2: beryllium chloride: 7787–47–5 BeF 2: beryllium fluoride ...
[102] [103] Alkaline earth difluorides possess strong ionic bonds but are insoluble in water, [86] with the exception of beryllium difluoride, which also exhibits some covalent character and has a quartz-like structure. [104] Rare earth elements and many other metals form mostly ionic trifluorides. [105] [106] [107]
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