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Class 12 Exam  >  Class 12 Questions  >  Each unit cell of NaCl consists of 14 chlorin... Start Learning for Free
Each unit cell of NaCl consists of 14 chlorine atoms and-
  • a)
    13 Na atoms 
  • b)
    14 Na atoms
  • c)
    6 Na atoms
  • d)
    8 Na atoms
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Each unit cell of NaCl consists of 14 chlorine atoms and-a)13 Na atoms...
Sodium chloride has a face centred cubic (fcc) structure. Na+ ions occupy the corners and face centres of a cube. The Cl – ions are present at the body and edge centres.One unit cell of sodium chloride consists of 14 Na+ ions and 13 Cl- ions or vice versa.
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Each unit cell of NaCl consists of 14 chlorine atoms and-a)13 Na atoms...
Concept:This structure is produced when salt is formed from equimolar quantities of cation and anion. There are 4 cation and anion per unit cell. Anion (Cl) form a FCC close packed unit cell and cations(Na) occupy the octahedral voids (holes).
Na ion per unit cell=12(at edge centre)+1(at body centre).=13 Cl ions per unit cell= 8(at corners)+ 6(at all faces)=14. Hence, answer is A.
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Each unit cell of NaCl consists of 14 chlorine atoms and-a)13 Na atomsb)14 Na atomsc)6 Na atomsd)8 Na atomsCorrect answer is option 'A'. Can you explain this answer?
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