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By X-ray studies, the packing atoms, in ...

By X-ray studies, the packing atoms, in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly idenctical. The density of gold is found to be ` 19.4 g cm^(-3)` and its atomic mass is 197 a.m.u.
The coordination number of gold atom in the crystal is

A

4

B

6

C

8

D

12

Text Solution

Verified by Experts

The correct Answer is:
D
The arrangement of layers is ABC ABC…. Type, i.e., it has cubic close packing arrangement . Hence, the coordination number is 12.
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Knowledge Check

  • By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly identical . The density of gold is found to be 19.4 g cm^(-3) and its atomic mass is 197 a.m.u. The fraction occupied by gold atoms in the crystal is

    A
    0.52
    B
    0.68
    C
    0.74
    D
    1

  • By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly identical . The density of gold is found to be 19.4 g cm^(-3) and its atomic mass is 197 a.m.u. The length of the edge of the unit cell will be

    A
    407 pm
    B
    189 pm
    C
    814 pm
    D
    204 pm

  • By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly identical . The density of gold is found to be 19.4 g cm^(-3) and its atomic mass is 197 a.m.u. The approximate number of unit cells present in 1 g of gold is

    A
    `3.06xx10^21`
    B
    `1.53xx10^21`
    C
    `3.82xx10^20`
    D
    `7.64xx10^20`