Conclusions Metals 1 Fill in the following table. Number of Metals** Packing Cry

Question

Conclusions Metals 1 Fill in the following table. Number of Metals** Packing Crystal Lattice Types for Metals Number of Atoms/Unit Cell Coordination Number Primitive cubic Body-centered cubic Hexagonal close packing Cubic close packing Efficiency* S2% 68% 74% 74% 12 0 12 *Packing Efficiency -% of space in unit cell occupied by atoms **Number of metal atoms with a particular type of crystal lattice. 2 (a) In which structure(s) does a metal atom form the greatest number of bonds? How many bonds is the atom forming? (b) What percentage of all metals have this structure(s)? 3 In which structure does a metal atom form the fewest number of bonds? How many bonds is the atom forming? (a) (b) What percentage of all metals have this structure?

Explanation / Answer

1) Crystal lattice type Number of atoms Coordination number Packing Efficiency Number of metal atoms

Primitive cubic 1 6 52% 1

Body-centered cubic 2 8 68% 2

Hexagonal close packing 6 12 74% 6

Cubic close packing 4 12 74% 4

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