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  2. Periodic table (crystal structure) - Wikipedia

    en.wikipedia.org/wiki/Periodic_table_(crystal...

    This structure can also be considered to be a distorted hcp lattice with the nearest neighbours in the same plane being approx 16% farther away [18] β-Po: A i: Rhombohedral: R 3 m (No. 166) 1 (rh.) 3 (hex.) Identical symmetry to the α-Hg structure, distinguished based on details about the basis vectors of its unit cell. γ-Se: A8: Hexagonal ...

  3. CR gas - Wikipedia

    en.wikipedia.org/wiki/CR_gas

    CR gas is a lachrymatory agent (LA), exerting its effects through activation of the TRPA1 channel. [ 5 ] [ 6 ] [ 7 ] Its effects are approximately 6 to 10 times more powerful than those of CS gas . CR causes intense skin irritation, in particular around moist areas; blepharospasm , causing temporary blindness; and coughing, gasping for breath ...

  4. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    [39] [58] This creates an analogous series in which the outer shell structures of sodium through argon are analogous to those of lithium through neon, and is the basis for the periodicity of chemical properties that the periodic table illustrates: [39] at regular but changing intervals of atomic numbers, the properties of the chemical elements ...

  5. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    The diamond crystal structure belongs to the face-centered cubic lattice, with a repeated two-atom pattern. In crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point). A lattice system is a set of Bravais lattices (an infinite array of discrete points).

  6. Structural chemistry - Wikipedia

    en.wikipedia.org/wiki/Structural_chemistry

    Structural chemistry is a part of chemistry and deals with spatial structures of molecules (in the gaseous, liquid or solid state) and solids (with extended structures that cannot be subdivided into molecules). For structure elucidation [1] a range of different methods is used.

  7. Cation-anion radius ratio - Wikipedia

    en.wikipedia.org/wiki/Cation-anion_radius_ratio

    In condensed matter physics and inorganic chemistry, the cation-anion radius ratio can be used to predict the crystal structure of an ionic compound based on the relative size of its atoms. It is defined as the ratio of the ionic radius of the positively charged cation to the ionic radius of the negatively charged anion in a cation-anion compound.

  8. GAMESS (US) - Wikipedia

    en.wikipedia.org/wiki/GAMESS_(US)

    GAMESS (US) can perform several general computational chemistry calculations, including Hartree–Fock method, density functional theory (DFT), generalized valence bond (GVB), and multi-configurational self-consistent field (MCSCF).

  9. File:CR gas structure.svg - Wikipedia

    en.wikipedia.org/wiki/File:CR_gas_structure.svg

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