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In a close packed structure, the atoms s...

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures.
A metal oxide crystallises with metal ions in 2/3 of octahedral voids and 1/3 voids remain vacant in a closed packed array of oxide ions. What is the formula of metal oxide.

Text Solution

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`M_2O_3`
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In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. A metal crystallises into two cubic phases, fcc and bcc. Which phase has lesser packing efficiency and how much ?

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. If edge length of a fcc unit cell of a metallic element is q, then the radius of an atom is ............. .

Knowledge Check

  • In a crystalline solid, anions B arranged in ccp lattice and cations A occupy 50% of the octahedral voids. And 50% of the tetrahedral voids. What is the formula of the solid?

    A
    AB
    B
    `A_(3)B_(2)`
    C
    `A_(2)B_(2)`
    D
    `A_(2)B_(3)`

  • In zinc blende structure anions are arranged in ccp and cations are present in the tetrachedral voids and only half the tetrahedral voids are occupied, the coordination numbers of cation and anion are respectively

    A
    4 and 8
    B
    4 and 4
    C
    8 and 4
    D
    8 and 6

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    In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. Predict the coordination number of Cs^(+) ion and structure of CsCl , if radii of Cs^(+) and Cl^(-) ions are 1.69 Å and 1.81 Å respectively.

    How many tetrahedral and octahedral void spaces are there for each sphere in close packing?

    CCP Packing,Location OF Tetrahedral and Octahedral Voids

    In solid, oxide ions are arranged in ccp. One sixth of the tetrahedral voids are occupied by the cations (A) while one third of the octahedral voids, are occupied by the cations (B). What is the formula of the compound ?

    A cubic solid is made by atoms A forming close pack arrangement, B occupying one. Fourth of tetrahedral void and C occupying half of the octahedral voids. What is the formula of compound

    A cubic solid is made by atoms A forming close pack arrangement, B occupying one. Fourth of tetrahedral void and C occupying half of the octahedral voids. What is the formula of compound.

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