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Eduncle posted an MCQ
October 19, 2019 • 18:26 pm 0 points
  • IIT JAM
  • Chemistry (CY)

The number of crystal systems and the number Bravais lattices are, respectively,

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    Eduncle Best Answer

    Crystal system is a method of classifying crystalline substances on the basis of their unit cell. There are seven unique crystal systems. The simplest and most symmetric, the cubic (or isometric) system, has the symmetry of a cube. The other six systems, in order of decreasing symmetry, are hexagonal, tetragonal, trigonal (also known as rhombohedral), orthorhombic, monoclinic and triclinic.
    Bravais lattice is a set of points constructed by translating a single point in discrete steps by a set of basis vectors. In 1848, the French physicist and crystallographer Auguste Bravais (1811-1863) established that in three-dimensional space only fourteen different lattices may be constructed. All crystalline materials recognised till now fit in one of these arrangements.

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