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Download PDF by C. Chambers, A. K. Holliday: Modern inorganic chemistry, and intermediate text

By C. Chambers, A. K. Holliday

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COMPLEX IONS The polyatomic ions discussed above are really simple members of a much larger group known collectively as complex ions, in which a central atom or ion is surrounded by other atoms, ions or groups of atoms, called ligands. Whenever an ion is formed in a polar solvent, ion-dipole attraction causes the solvent molecules to orientate themselves around the ion producing a solvated ion, for example [Na(H2O)J + . For large ions of small charge these attractive forces are weak and are not of any great importance.

E. H cr N" H /\^H /" H / i I The strongly electronegative (p. 49) chlorine atom becomes a chloride ion, the proton H^ accepting the electron pair donated by the nitrogen atom. /o -H^'" V H H H (ammonia hydrate"-weakly associated through hydrogen bonding, p 52; H ,*t N The positive charge resulting from the addition of a proton on to an ammonia molecule is not associated with any particular hydrogen atom, once the bond is formed, and is distributed over the whole ion. Oxo-acid anions There are many simple examples of common covalently bonded oxoanions, some being: COj~, NO^, SO^ and PO|~.

Two-electron affinities are known in only a few cases. 5. 5 Atomic number 8 16 Element 0 Electron affinity (kJ mol ') — 1st 2nd - 142 - 200 s + 844 4- 532 Total + 702 + 332 the formation of the divalent ion is an endothermic process in spite of the fact that a noble gas configuration is achieved. 6 shows the electron affinities, for the addition of one electron to elements in Periods 2 and 3. Energy is evolved by many atoms when they accept electrons. In the cases in which energy is absorbed it will be noted that the new electron enters either a previously unoccupied orbital or a half-filled orbital; thus in beryllium or magnesium the new electron enters the p orbital, and in nitrogen electron-pairing in the p orbitals is necessary.

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Modern inorganic chemistry, and intermediate text by C. Chambers, A. K. Holliday

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