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How many types of two-dimensional lattic...

How many types of two-dimensional lattice exist? Why pentagonal latticis not possible?

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Five types, namely (a) hexagonal, (b) square, (c ) rectangular, (d) rhombic, and € parallelogram.
Pentagonal lattice is not possible because the interior angle of a regular pentagon is `108^(@)` which is not an integral factor of `360^(@)`.
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CENGAGE CHEMISTRY-NCERT BASED EXERCISE-Short Answer Type Questions
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  2. How many types of centred unit cells exist?

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  3. How many types of two-dimensional lattice exist? Why pentagonal lattic...

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  4. How many TVs and OV s occur per unit cell and per atom in a closest pa...

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  5. Where the TVs and OV s are located in a closet packed structure?

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  6. What is the distance between two TVs?

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  7. In an hcp structure, calculate a. Z("eff) Base area of hexagon c...

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  8. In a diamond cubic (dc) structure, calculate (a) Z("eff")(b) CN radi...

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  9. What is the ratio of (TV//OV)("occupied") in spinel an inverse spinel...

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  10. What is the CN of cation and anion in a corundum structure?

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  11. What is the occurrence of different forms of the same compound called?

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  12. How many types of allotropy exist?

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  13. How can a substance be made amorphous?

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  14. Why does ZnO show increased electrical conductivity and turns yellow o...

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  15. Why NiO and FeO are nonstroichiometric with the formula Ni(0.98)O and ...

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  16. Why the defectsof the crystalline solids are called thermodynamic defe...

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  17. Why stoichiometric defects are also called intrinsic defects?

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  18. Give the name of one solid which shows both Schottky and Frenkel defec...

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  19. Why Frenkel defects are not found in pure alkali metal halides?

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