Distinguish between :
i) hexagonal closed - packing and cubic closed - packing
ii) crystal lattice and unit cell.

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Solution

Q1)
Hexagonal closed packing Cubic Closed Packing
1.The layers are arranged as cycle among the two equivalent shifted positions. 1. The layers in ccp cycles between the three equivalent positions.
2.Here atom planes are stacked in ABABAB form while , 2. In CCp, the atoms are stacked in ABCABC form.
3. They are not ductile as ccp metals. 3. Their lattice allows a slippage to occur more easily and so they are ductile.
Q2)
Dear student!
These terms could not be differentiated as the unit cell is the smallest three dimensional portion or unit of the crystal lattice so it could not be differentiated from the crystal lattice.

Hexagonal closed packing	Cubic Closed Packing
1.The layers are arranged as cycle among the two equivalent shifted positions.	1. The layers in ccp cycles between the three equivalent positions.
2.Here atom planes are stacked in ABABAB form while ,	2. In CCp, the atoms are stacked in ABCABC form.
3. They are not ductile as ccp metals.	3. Their lattice allows a slippage to occur more easily and so they are ductile.