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  2. Seesaw molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Seesaw_molecular_geometry

    The seesaw geometry occurs when a molecule has a steric number of 5, with the central atom being bonded to 4 other atoms and 1 lone pair (AX 4 E 1 in AXE notation). An atom bonded to 5 other atoms (and no lone pairs) forms a trigonal bipyramid with two axial and three equatorial positions, but in the seesaw geometry one of the atoms is replaced ...

  3. Chemical polarity - Wikipedia

    en.wikipedia.org/wiki/Chemical_polarity

    A molecule may be polar either as a result of polar bonds due to differences in electronegativity as described above, or as a result of an asymmetric arrangement of nonpolar covalent bonds and non-bonding pairs of electrons known as a full molecular orbital. While the molecules can be described as "polar covalent", "nonpolar covalent", or ...

  4. Selenium tetrachloride - Wikipedia

    en.wikipedia.org/wiki/Selenium_tetrachloride

    The volatility of selenium tetrachloride can be exploited to purification of selenium. Solid SeCl 4 is actually a tetrameric cubane-type cluster, for which the Se atom of an SeCl 6 octahedron sits on four corners of the cube and the bridging Cl atoms sit on the other four corners. The bridging Se-Cl distances are longer than the terminal Se-Cl ...

  5. Sulfur tetrafluoride - Wikipedia

    en.wikipedia.org/wiki/Sulfur_tetrafluoride

    Sulfur tetrafluoride is a chemical compound with the formula S F 4. It is a colorless corrosive gas that releases dangerous hydrogen fluoride gas upon exposure to water or moisture. Sulfur tetrafluoride is a useful reagent for the preparation of organofluorine compounds , [ 3 ] some of which are important in the pharmaceutical and specialty ...

  6. Selenium tetrafluoride - Wikipedia

    en.wikipedia.org/wiki/Selenium_tetrafluoride

    Selenium tetrafluoride (Se F 4) is an inorganic compound.It is a colourless liquid that reacts readily with water. It can be used as a fluorinating reagent in organic syntheses (fluorination of alcohols, carboxylic acids or carbonyl compounds) and has advantages over sulfur tetrafluoride in that milder conditions can be employed and it is a liquid rather than a gas.

  7. Tellurium tetrachloride - Wikipedia

    en.wikipedia.org/wiki/Tellurium_tetrachloride

    Tellurium tetrachloride is the inorganic compound with the empirical formula TeCl 4. The compound is volatile, subliming at 200 °C at 0.1 mmHg. [2] Molten TeCl 4 is ionic, dissociating into TeCl 3 + and Te 2 Cl 10 2−. [2]

  8. Pentagonal bipyramidal molecular geometry - Wikipedia

    en.wikipedia.org/wiki/Pentagonal_bipyramidal...

    The pentagonal bipyramid is a case where bond angles surrounding an atom are not identical (see also trigonal bipyramidal molecular geometry). [ 1 ] [ page needed ] This is one of the three common shapes for heptacoordinate transition metal complexes, along with the capped octahedron and the capped trigonal prism .

  9. Selenium dioxide - Wikipedia

    en.wikipedia.org/wiki/Selenium_dioxide

    Solid SeO 2 is a one-dimensional polymer, the chain consisting of alternating selenium and oxygen atoms. Each Se atom is pyramidal and bears a terminal oxide group. The bridging Se-O bond lengths are 179 pm and the terminal Se-O distance is 162 pm. [5] The relative stereochemistry at Se alternates along the polymer chain (syndiotactic).