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(a) What is the C.N. of Cr atom in bcc s...

(a) What is the C.N. of Cr atom in bcc structure ?
(b) Cobalt metal crystallises in a hexagonal closest packed structure. What is the C.N. of cobalt atom?
(c) Describe the crystal structure of Pt, which crystallises with four equivalent atoms in a cubic unit cell

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(a) 8 (b) 12 (c) fcc or cubic close packed.
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