THE STRUCTURE OF BINARY COMPOUNDS. THE AX,, A2X3, AX,, AX4 COHPOUNDS. SUMHARY
THE STRUCTURES OF AX2 COMPOUNDS
L IKE compounds of the general formula AX, the 6 compounds may be formed with ionic, covalent, or molecular forces, and the structures of these compounds are determined by the relative sizes and the polarization properties of their building stones. It is helpful to mark the AX2 regions on the chart.* There are three main groups: one, at the left, running diagonally downward from left to right, includes the AX2 compounds of ions with the rare gas configuration. A second, past the center and also running downward from left to right, contains compounds in which the cation has a completed eighteenelectron shell. A third, zone VII, includes the transition elements, those with incomplete eighteen-electron shells.
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THE STRUCTURES OF A2X3 COMPOUNDS
Nearly all the AzX? compounds whose structures have been studied are oxides. Inasmuch as the oxide ion is not easily polarized, the crystals of A2Xs compounds are essentially ionic and their structures depend upon the relative sizes of the ions, as is evident from the data in Table 24.
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