He assumed that Li + would be the smallest ion found in crystals.
An early attempt to develop a self-consistent set of ionic radii was made by Lande in 1920. Unfortunately, atoms do not always touch along an edge so that the unit cell length cannot be directly related to the ionic radius of an atom. Ionic radii are determined experimentally from the unit cell dimensions, such as the edge length. Which packing model is used? (Note: This is a rhombus – not a cube) What is the coordination geometry for the Ti?Ī diagram of the unit cell for nickel arsenide is shown below. What is the Coordination Geometry for the zinc?Ī diagram of the unit cell for perovskite, a mineral containing calcium, titanium, and oxygen. What is the Coordination Number for the aluminum? What is the empirical formula of this compound? What is the formula for the compound that crystallizes with a cubic closest packed array of sulfur atoms, and that contains zinc ions in 1/8 of the tetrahedral holes and aluminum ions in 8 of the octahedral holes?
The ions shown in the face-centered cubic diagram below are sulfide, S -2.ĭraw in zinc cations into tetrahedral holes of the diagram below based on an empirical formula of ZnS.ĭraw in the chloride ions as simple cubic packing. What is the coordination number of the barium?ĭoes this empirical formula agree with your chemical intuition? Why or Why not? The cations shown in the face-centered unit cell diagram below are Ba +2.ĭraw in chloride (Cl-) anions into all the tetrahedral holes. How would you describe the interstitial holes occupied by atoms B? What is the empirical formula for this salt? Show your work. How would you describe the interstitial hole occupied by atom B? The ions shown in the unit cell diagram below are Cl-.ĭraw in sodium (Na+) cations into all the octahedral holes. What is the coordination geometry of chloride? What is the coordination number of chloride?
What is the coordination geometry of sodium? What is the coordination number of sodium? The cations shown in the unit cell diagram below are Na+.ĭraw in chloride (Cl-) anions into all the octahedral holes.ĭetermine the empirical formula of this compound. \)įor more practice with visualization of ionic solids and geometries:
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