In crystal structure of NaCl, the arrangement of Cl- ions is:
Correct answer: A. Face centered cubic
- A. Face centered cubic
- B. Body centered cubic
- C. Simple Cubic
- D. Hexagonal
Explanation
Option A is correct.The arrangement of Cl- ions in the crystal structure of NaCl is face centered cubic. In a face centered cubic (fcc) crystal, each atom is surrounded by 12 other atoms. The Cl- ions in NaCl are arranged in a fcc lattice, with the Na+ ions occupying the octahedral voids. This means that each Cl- ion is surrounded by six Na+ ions, and each Na+ ion is surrounded by six Cl- ions. The fcc crystal structure is the most common crystal structure for ionic compounds. It is also the crystal structure of metals such as aluminum and copper.
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About Shape of Ionic Crystals
Ionic crystal shape depends on the regular arrangement of oppositely charged ions in a three-dimensional lattice. The topic covers coordination number, radius ratios, lattice geometry and structures such as sodium chloride, caesium chloride and zinc sulfide, which should not be confused with the molecular shapes predicted by VSEPR theory.
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