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Question
For a crystal of sodium chloride, state:
1) The type of lattice in which it crystallises
2) The coordina~ion number of each sodium ion and chloride ion in the crystal lattice.
3) The number of sodium ions and chloride ions present in a unit cell of sodium chloride.
4) The structural arrangement of the sodium chloride crystaL
Solution
1) NaCl crystallises in FCC lattice
2) Each Na+ ion is surrounded by six Cl- ions and each Cl- ion is surrounded by six Na+ ions.
3) Number of Cl- ions = 4
Number of Na+ ions 4
4) In the NaCl crystal, Cl- ions occupy all the FCC positions and Na+ ions occupy the octahedral voids.
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