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11 Dec 2019

Find the ionic radii of each ion in the following compounds:

(a) BeS (rock-salt structure, S2- are at the corners and faces of the cell, Be2+ are at the center of each edge, and the sulfur atoms touch across each face), edge of the unit cell = 5.65 รƒ .

(b) NH4Cl (simple-cubic, Cl- at each corner, NH4+ at the body center, the chlorides touch along an edge), the unit cell edge = 6.49 รƒ . The ammonium ion behaves as a sphere.

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