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Crystalline boron is a hard, black material with a melting point of above 2000 °C. Crystalline boron is chemically inert and resistant to attack by boiling hydrofluoric or hydrochloric acid . When finely divided, it is attacked slowly by hot concentrated hydrogen peroxide , hot concentrated nitric acid , hot sulfuric acid or hot mixture of ...
2970 °C: 5378 °F 5 B boron; use: 4200 K: 3927 °C: 7101 °F WebEl: 4200 K: 3927 °C: ... "Estimation Chemical Form Boiling Point Elementary Astatine by Radio Gas ...
5 B boron; use (T/K) 2348 2562 2822 3141 3545 4072 CRC.b (T/°C) 2075 2289 2549 ... The temperature at standard pressure should be equal to the normal boiling point, ...
The elements in group 13 are also capable of forming stable compounds with the halogens, usually with the formula MX 3 (where M is a boron-group element and X is a halogen.) [14] Fluorine, the first halogen, is able to form stable compounds with every element that has been tested (except neon and helium), [15] and the boron group is no exception.
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The wurtzite form of boron nitride (w-BN; point group = C 6v; space group = P6 3 mc) has the same structure as lonsdaleite, a rare hexagonal polymorph of carbon. As in the cubic form, the boron and nitrogen atoms are grouped into tetrahedra. [7] In the wurtzite form, the boron and nitrogen atoms are grouped into 6-membered rings.
The three oxygen atoms form a trigonal planar geometry around the boron. The B-O bond length is 136 pm and the O-H is 97 pm. The molecular point group is C 3h. [5] Two crystalline forms of orthoboric acid are known: triclinic with space group P 1, and trigonal with space group P3 2. The former is the most common; the second, which is a bit more ...
Boiling point (°C) K b (°C⋅kg/mol) Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] Lauric acid: 298.9 44