Question

number of second neighbours of Na+ in NaCl lattice​

Answer 1

Answer:

In NaCl crystal each Na+ ions has 12 Na+ ions as the second nearest neighbour. NaCl crystal has FCC structure....

Answer 2

12 Na+

explanation-:NaCl, Cl- ions have FCC structure, with Na+ ions in the octahedral voids.Now, octahedral voids occur at edge centre and body centre.Consider the Na+ ion sitting at the body centre(tetrahedral void). the Nearest neighbour would be the face centres(Cl-ions). these would be 6 in number.Now comes the next nearest neighbours. These are other Na+ ions sitting at edge centres. These would be 12 in number(12 edges surrounding a body centre).So the the next nearest neighbours of Na+ would be 12 more Na+ ions at a distance of a/√ 2.

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