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  2. Phosphorus pentafluoride - Wikipedia

    en.wikipedia.org/wiki/Phosphorus_pentafluoride

    Phosphorus pentafluoride is a Lewis acid.This property is relevant to its ready hydrolysis. A well studied adduct is PF 5 with pyridine.With primary and secondary amines, the adducts convert readily to dimeric amido-bridged derivatives with the formula [PF 4 (NR 2)] 2.

  3. Three-center four-electron bond - Wikipedia

    en.wikipedia.org/.../Three-center_four-electron_bond

    Figure 2: A donor-acceptor interaction diagram illustrating construction of the triiodide anion σ natural bond orbitals from I 2 and I − fragments. In the natural bond orbital viewpoint of 3c–4e bonding, the triiodide anion is constructed from the combination of the diiodine (I 2) σ molecular orbitals and an iodide (I −) lone pair.

  4. Trigonal bipyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Trigonal_bipyramidal...

    In chemistry, a trigonal bipyramid formation is a molecular geometry with one atom at the center and 5 more atoms at the corners of a triangular bipyramid. [1] This is one geometry for which the bond angles surrounding the central atom are not identical (see also pentagonal bipyramid), because there is no geometrical arrangement with five terminal atoms in equivalent positions.

  5. Chemical bond - Wikipedia

    en.wikipedia.org/wiki/Chemical_bond

    Molecules that are formed primarily from non-polar covalent bonds are often immiscible in water or other polar solvents, but much more soluble in non-polar solvents such as hexane. A polar covalent bond is a covalent bond with a significant ionic character. This means that the two shared electrons are closer to one of the atoms than the other ...

  6. Chemical polarity - Wikipedia

    en.wikipedia.org/wiki/Chemical_polarity

    Bond polarity is typically divided into three groups that are loosely based on the difference in electronegativity between the two bonded atoms. According to the Pauling scale: Nonpolar bonds generally occur when the difference in electronegativity between the two atoms is less than 0.5

  7. Getting rid of the penny introduces a new problem: nickels - AOL

    www.aol.com/getting-rid-penny-introduces-problem...

    Getting rid of the penny, which cost the government 3 cents each, could end up costing the Treasury Department money if it has to make more nickels, which cost nearly 14 cents each to make and ...

  8. Phosphorus pentachloride - Wikipedia

    en.wikipedia.org/wiki/Phosphorus_pentachloride

    6, see below) can be explained with the inclusion of non-bonding molecular orbitals (molecular orbital theory) or resonance (valence bond theory). This trigonal bipyramidal structure persists in nonpolar solvents, such as CS 2 and CCl 4. [5] In the solid state PCl 5 is an ionic compound called tetrachlorophosphonium hexachlorophosphate ...

  9. What is the blue tent in NFL? Why injured players get ... - AOL

    www.aol.com/blue-tent-nfl-why-injured-123706176.html

    As Super Bowl 59 approaches, fans are asking various questions about the event, including what the blue tent on the sideline during NFL games is used for.. The blue tent on the sidelines plays an ...