Question

Sample Question :- [ 1 ]

How will you distinguish between the following pairs of terms :
(i) Tetrahedral and octahedral voids
(ii) Crystal lattice and unit cell (All India) 2014

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Answer 1

Answer:

1. Tetrahedral voids are unoccupied empty spaces present in substances having a tetrahedral crystal system. Octahedral voids are unoccupied empty spaces present in substances having an octahedral crystal system.
2. The crystal lattice is the arrangement of the constituent particles like atoms, molecules, or ions in a three-dimensional surface. ... On the other hand, the unit cell is known to be the building blocks of the crystal lattice, as they get repeated in three-dimensional space to yield shape to the crysta

Step-by-step explanation:

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Answer 2

⌬ Tetrahedral Voids :

• ➮ It is much smaller than the size of spheres in the packing.
• ➮ Each tetrahedral void is surrounded by 4 spheres.
• ➮ Hence, coordination number is 4

⌬ Octahedral Voids :

• ➮ Size is much larger than tetrahedral voids.
• ➮ Each octahedral void is surrounded by 6 spheres.
• ➮ Hence, its coordination number is 6.

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★ Crystal lattice and unit cell ?

• ⇒A regular arrangement of the constituent particles of a crystal in a three dimensional space is called crystal lattice.
• ⇒ The smallest three dimensional portion of a complete crystal lattice, which when repeated over and again in different directions produces the complete crystal lattice is called the unit cell.

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