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Mention the two crystal systems in which...

Mention the two crystal systems in which all edge lengths in their unit cell are the same. 

Text Solution

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Cubic and Rhombohedral [or trigonal]
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What is the contribution of the atom present at edge centre of the unit cell ?

In a face centred cubic unit cell of close packed atoms, the radius of atom ( r ) is related to the edge length (a) of the unit cell by the expression

An element crystallizes in fcc lattice. If the edge length of the unit cell is 408.6 pm and the density is 10.5 g cm^(-3) . Calculate the atomic mass of the element.

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Knowledge Check

  • What is the contribution of the atom present at edge centre of the unit cell ?

    A
    1 part
    B
    `1/2 `part
    C
    `1/4 `part
    D
    `1/8`part

  • In a face centred cubic unit cell of close packed atoms, the radius of atom ( r ) is related to the edge length (a) of the unit cell by the expression

    A
    `r = ( a)/( sqrt(2))`
    B
    `r = ( a)/( 2)`
    C
    `r = ( a)/( 2 sqrt(2))`
    D
    `r = ( sqrt(3)a)/(4)`