Unformatted text preview: If the unit cell edge is 513 pm, what is the radius of a chloride ion? (hint – use the Pythagorean theorem…what is the face diagonal equal to given the first sentence of this problem?) 181 pm 4. Europium is one of the lanthanide elements used in TV screens. Europium crystallizes in a unit cell with coordination number of 8 and an edge length of 240.6 pm. Calculate the radius of a europium atom. 104.2 pm 5. You are given a small bar of an unknown metal. You find the density of the metal to be 10.5 g/cm 3 . An Xray diffraction experiment measures the edge of the facecentered cubic unit cell as 4.09 Å. (1 Å = 1 x 1010 m). Identify this metal. MW= 108 g/mol and therefore is Ag...
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 Winter '08
 Hascall
 Atom, Ion, Europium

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