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Get Chemistry for Technologists PDF

By G. R. Palin and N. Hiller (Auth.)

ISBN-10: 0080163866

ISBN-13: 9780080163864

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If these were the only bonding electrons, the compound of carbon with hydrogen would have the formula C H 2, and the bonds would be approximately at right-angles. The simplest compound of carbon and hydrogen is methane, C H 4, and the four single covalent bonds in the molecule point to the corners of a regular tetrahedron, with the carbon atom at the centre. Carbon shows a similar bonding arrangement in a vast number of compounds, a n d to explain this it is necessary to postulate a change in the electronic configuration of carbon before the bonding occurs.

E. the lowest possible energy state. The most suitable arrangement is determined by the geometry of the ions concerned, and by the charges they carry. The basic arrangement involves only a small number of ions, 40 FORCES IN 41 SOLIDS and is known as the unit cell. This is repeated throughout the crystal. Diagrammatic representation of the unit cell is difficult, even if the ions are drawn as spheres, and it is customary to indicate the position of the ions by drawing a lattice. This is a framework which is drawn showing the positions of the centres of the ions in the unit cell.

13. It can be seen from the lattice diagram t h a t the central sodium ion is surrounded by six chlorine ions in an octahedral arrangement, and this applies to all the sodium ions if the pattern is extended. Similarly each chlorine ion is surrounded by six sodium ions, also in a n octahedral arrangement. 732. The coordination number is determined solely by ionic sizes, and the amounts of each species present. The lattice shown in Fig. 14a is one in which the coordination number of both ions is eight, and the arrangement is cubic.

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Chemistry for Technologists by G. R. Palin and N. Hiller (Auth.)

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