Q.

Sodium (Na = 23) crystallizes in bcc arrangement with the interfacial separation between the atom at the edge 53.6 pm. The density of sodium crystal is:

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2.07 g/cc

2.46 g/cc

1.19 g/cc

2.23 g/cc

answer is 3.

(Detailed Solution Below)

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Detailed Solution

a−2r=53.6pm also 4r=3a⇒ a−32a=53.6⇒ a=53.6×22−3=400pm Density (ρ)=2×236.023×1023×43×10−24=1.19g/cc

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