Mcq on crystallography

  • What is crystal structure in crystallography?

    A crystal structure is a unique arrangement of atoms, molecules or ions in a crystal.
    It is composed of a motif, which is a set of atoms arranged in a particular way, and a lattice.
    Motifs are located upon the points of lattice, which is an array of points repeating periodically in three dimensions..

  • What is the basis of crystallography?

    The basis is the arrangement of atoms associated with each lattice point.
    Sometimes there is only one atom per lattice point – a monatomic lattice – but often there are more.
    Mathematically, this association of one copy of something with every point is a convolution..

  • In total there are seven crystal systems: triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic.

How do you calculate 7 crystal systems?

Derive the 7 crystal systems by varying the lattice constants a, b, c and angles α, β, γ

For a given repeating pattern, determine the crystal basis and Bravais lattice

Sketch the simple cubic, body-centered cubic, and face-centered cubic structures, and calculate key parameters such as the lattice constant, atomic radius, and packing density

What is a crystalline structure compared to a non crystalline form?

Clarification: A crystalline structure has very close packing of atoms thus giving rise tohigh density to material it possesses when compared to its non-crystalline form

For example, quartz being the crystalline form of silica has a density of about 2

65 gm/cm3, whereas its ally–non-crystalline form silica glass has a density of 2

20 gm/cm3

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