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  2. Chromium(VI) oxide peroxide - Wikipedia

    en.wikipedia.org/wiki/Chromium(VI)_oxide_peroxide

    2 cro(o 2) 2 + 7 h 2 o 2 + 6 h + → 2 cr 3+ + 10 h 2 o + 7 o 2 Stable adducts of the type CrO(O 2 ) 2 L include those with L = diethyl ether , 1-butanol , ethyl acetate , or amyl acetate . They form by adding a layer of the organic solvent above the chromate/dichromate solution and shaking during the addition of hydrogen peroxide.

  3. List of character tables for chemically important 3D point groups

    en.wikipedia.org/wiki/List_of_character_tables...

    The two rightmost columns indicate which irreducible representations describe the symmetry transformations of the three Cartesian coordinates (x, y and z), rotations about those three coordinates (R x, R y and R z), and functions of the quadratic terms of the coordinates(x 2, y 2, z 2, xy, xz, and yz).

  4. Periodic table (crystal structure) - Wikipedia

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

    R 3 m (No. 166) 2 (rh.) 6 (hex.) in grey metallic form, each As atom has 3 neighbours in the same sheet at 251.7pm; 3 in adjacent sheet at 312.0 pm. [18] each Bi atom has 3 neighbours in the same sheet at 307.2 pm; 3 in adjacent sheet at 352.9 pm. [18] each Sb atom has 3 neighbours in the same sheet at 290.8pm; 3 in adjacent sheet at 335.5 pm. [18]

  5. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    Download as PDF; Printable version ... of the periodic law was one of the founding developments of modern chemistry. ... 2.60: 3 × 10 −5: primordial gas 55 Cs Caesium

  6. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    2.1.3 Period 5. 2.2 Transition metals. 2.2.1 First. ... Download as PDF; Printable version; In other projects ... Many chemistry aspects, rules, names of compounds ...

  7. Lewis structure - Wikipedia

    en.wikipedia.org/wiki/Lewis_structure

    [1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [4] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.

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