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Is the shape of a tetrahedral void tetra...

Is the shape of a tetrahedral void tetrahedral? If not, why is it so called?

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The shape of a tetrahedral void is not tetrahedral. This void is so named because in a close-packed structure of particles, it is formed due to tetrahedral disposition of four nearest neighbour particles.
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Knowledge Check

  • The number of packed particles in a cubic close-packed structure is x. If the number of tetrahedral and octahedral holes in this structure are y and z, then-

    A
    x = y = z
    B
    x = y = 2z
    C
    x = 2y = 2z
    D
    `x=y/2=z`

  • Which of the following is not tetrahedral ?

    A
    `BF_4^-`
    B
    `NH_4^+`
    C
    `CO_3^(2-)`
    D
    `SO_4^(2-)`

  • No. of tetrahedral voids per unit cell in NaCl crystal is-

    A
    4
    B
    8
    C
    twice the number of octahedral voids
    D
    four times the number of octahedral voids

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    The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. A double triangular void surrounded by three spheres above and three spheres below is called

    Why is the sea cow so called?

    Assertion : The number of tetrahedral voids is double the number of octahedral voids Reason : The size of the tetrahedral voids is half of that of the octahedral void

    What is inorganic graphite? Why is it so called?

    The total of tetrahedral and octahedral voids in the face centred unit cell is …………. .

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