CHEM-002 Lecture Notes - Lecture 26: Caesium, Coordination Number, Ion
22 Apr 2017
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The packing efficiency of the cubics is not dependent on the size or weight of the atoms, but just on the type of packing. The cation is often smaller than the anion. A molecule in a cubic orientation must have a coordination number of 4, 6, or 8 must be a multiple of these. If i see 5, i"(cid:373) (cid:449)ro(cid:374)g has to be 6 or 8. In ionic solids, you have more than one kind of io(cid:374) (cid:449)ith differe(cid:374)t size a(cid:374)d the(cid:455)"re oppositel(cid:455) charged like ions are trying to get way from each other. Whe(cid:374) deter(cid:373)i(cid:374)i(cid:374)g the stru(cid:272)ture, o(cid:374)l(cid:455) (cid:272)o(cid:374)sider o(cid:374)e of the ato(cid:373)s! If there"s a (cid:272)esiu(cid:373) i(cid:374) the center and chlorides in the corners, it is primitive with respect to the chloride. With something like cscl, you can actually switch the positions since they have the same charges. Use the orientation of the atoms to calculate volume find the radius, where it intersects the cube, etc.
