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Phosphorus pentabromide is a reactive, yellow solid of formula P Br 5, which has the structure [PBr 4] + Br − (tetrabromophosphonium bromide) in the solid state but in the vapor phase is completely dissociated to PBr 3 and Br 2.
The polarizability of an atom or molecule is defined as the ratio of its induced dipole moment to the local electric field; in a crystalline solid, one considers the dipole moment per unit cell. [1] Note that the local electric field seen by a molecule is generally different from the macroscopic electric field that would be measured externally.
Two more allotropes, γ and σ, exist at temperatures above 161 °C and pressures above several GPa. [23] White tin is metallic, and is the stable crystalline form at or above room temperature. Below 13.2 °C, tin exists in the gray form, which has a diamond cubic crystal structure, similar to diamond, silicon or germanium.
Depending on a solid surface's ability to successfully form a conjugate base by absorbing an electrically neutral acid, basic strength of the surface is determined. [15] The "number of basic sites per unit surface area of the solid" is used to express how much basic strength is found on a solid base catalyst. [15]
The charged components that make up ionic solids cannot exist in the high-density sea of delocalized electrons characteristic of strong metallic bonding. Some molecular salts, however, feature both ionic bonding among molecules and substantial one-dimensional conductivity , indicating a degree of metallic bonding among structural components ...
Polar Express. The Polar Express is a very popular animated movie based on a book of the same name. The film, which stars Tom Hanks and was released in October 2004, tells the story of a young boy ...
Polymorphism is the ability of a solid to exist in more than one crystal form. For example, water ice is ordinarily found in the hexagonal form Ice I h, but can also exist as the cubic Ice I c, the rhombohedral ice II, and many other forms. The different polymorphs are usually called different phases.
"The Polar Express" came out in 2004, but fans may have missed these sneaky details. There are references to "Back to the Future," which shares a director with the Christmas film.. The level of ...