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The hydrogen spectral series can be expressed simply in terms of the Rydberg constant for hydrogen and the Rydberg formula. In atomic physics , Rydberg unit of energy , symbol Ry, corresponds to the energy of the photon whose wavenumber is the Rydberg constant, i.e. the ionization energy of the hydrogen atom in a simplified Bohr model.
In 1890, Rydberg proposed on a formula describing the relation between the wavelengths in spectral lines of alkali metals. [2]: v1:376 He noticed that lines came in series and he found that he could simplify his calculations using the wavenumber (the number of waves occupying the unit length, equal to 1/λ, the inverse of the wavelength) as his unit of measurement.
Rhodium is a chemical element; it has symbol Rh and atomic number 45. It is a very rare, ... a tetrameric complex with the true formula Rh 4 F 20) and rhodium ...
Bis(triphenylphosphine)rhodium carbonyl chloride is the organorhodium complex with the formula [RhCl(CO)(PPh 3) 2]. This complex of rhodium(I) is a bright yellow, air-stable solid. It is the Rh analogue of Vaska's complex, the corresponding iridium complex.
Rhodocene is a chemical compound with the formula [Rh(C 5 H 5) 2]. Each molecule contains an atom of rhodium bound between two planar aromatic systems of five carbon atoms known as cyclopentadienyl rings in a sandwich arrangement. It is an organometallic compound as it has covalent rhodium–carbon bonds. [2]
Rhodium(III) nitrate is a inorganic compound, a salt of rhodium and nitric acid with the formula Rh(NO 3) 3.This anhydrous complex has been the subject of theoretical analysis but has not been isolated. [4]
Rhodium acetylacetonate is the coordination complex with the formula Rh(C 5 H 7 O 2) 3, which is sometimes known as Rh(acac) 3. The molecule has D 3-symmetry. It is a yellow-orange solid that is soluble in organic solvents. It is prepared from RhCl 3 (H 2 O) 3 and acetylacetone. [1]
Rhodium(II) acetate is the coordination compound with the formula Rh 2 (AcO) 4, where AcO − is the acetate ion (CH 3 CO − 2). This dark green powder is slightly soluble in polar solvents, including water. It is used as a catalyst for cyclopropanation of alkenes. It is a widely studied example of a transition metal carboxylate complex. [2]