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The most malleable metals (Cu,Ag,Au) hav...

The most malleable metals (Cu,Ag,Au) have close-packaing of the type:

A

Hexagonal closse-packing

B

Cubic close-packing

C

Body-centred cubic packing

D

Malleablity is not related to type of paacking

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The correct Answer is:
To solve the question regarding the close packing type of the most malleable metals (Cu, Ag, Au), we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Malleability**: - Malleable metals are those that can be hammered or pressed into thin sheets without breaking. This property is crucial for their applications in various industries. 2. **Identifying the Metals**: - The metals in question are Copper (Cu), Silver (Ag), and Gold (Au). These are known for their malleability and belong to the same group in the periodic table. 3. **Determining the Close Packing Structure**: - The close packing structures relevant to metals include: - Hexagonal Close Packing (HCP) - Face-Centered Cubic (FCC) or Cubic Close Packing (CCP) - Body-Centered Cubic (BCC) 4. **Analyzing the Crystallization of Each Metal**: - Silver (Ag) crystallizes in the Face-Centered Cubic (FCC) structure. - Copper (Cu) also crystallizes in the FCC structure. - Gold (Au) crystallizes in the FCC structure as well. 5. **Understanding FCC Structure**: - In the FCC arrangement, atoms are located at each corner of the cube and at the center of each face. This results in a close packing arrangement that allows for high coordination numbers (12 in this case). 6. **Conclusion**: - Since all three metals (Cu, Ag, Au) crystallize in the FCC structure, we conclude that the close packing type for these malleable metals is **Cubic Close Packing (FCC)**. ### Final Answer: The most malleable metals (Cu, Ag, Au) have close packing of the type: **Cubic Close Packing (FCC)**. ---
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