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What is a tetragonal system?

Updated: 12/6/2022
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Q: What is a tetragonal system?
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What is the crystal system?

It is a system of classification of crystals into 7 crystal systems(Cubic,Tetragonal,Othorgonal,Hexagonal,Trigonal.Monoclinic and Triclinic) on the basis of their Geometrical properties and symmetry (Diads,Triads,Tetrads,Planes of symmetry,Centre of symmetry)


What is crystal structure of CaO2?

Calcium peroxide has a tetragonal crystalline structure.


Why is there no face centered hexagonal lattice?

Simple reason - It violates the cubic symmetry. To see it from another perspective - Base centered cubic lattice is equivalent to a simple tetragonal lattice. Draw two unit cells adjacent to each other. Then connect the base center points to the corener points which are shared by these two unit cells. Then connect the two base centered point in each unit cell. Now you have a simple tetragonal lattice. Simple tetragonal lattice has one lattice point per unit cell compared to two lattice point per unit cell of base centered lattice. Always the lower lattice point lattice is considered for a given symmetry. Because of symmetry breaking, the symmetry of base centered cubic lattice is same as tetragonal lattice.


What is the intermolecular interaction of CI4?

There's no such compound. If you meant CCl4, with a lower-case L instead of an upper-case I, it's tetragonal.


How many types of crystals present?

The problem is that "types" is not a well-defined word in the contest of this problem. Do you mean morphology, lattice system, space group, or what? There are more or less infinitely many possible morphologies (I'm pretty sure, though I wouldn't necessarily want to try to prove it, that it's a countable infinity). There are 7 lattice systems: triclinic, monoclinic, orthorhombic, rhombohedral, tetragonal, hexagonal, and cubic. There are 230 distinct space groups, and no I'm not going to list them. Get a graduate-level chemistry book on X-ray crystallography if you really want the details.