Sodium has body centred packing. Distance between two nearest atoms is 3.7 . The lattice parameter is:

NEET 2009 Chemistry question

Not in JEE Main or NEET syllabus

Sodium has body centred packing. Distance between two nearest atoms is . The lattice parameter is:

(1)Correct
(2)
(3)
(4)

Answer: (1)

Solution

In a body-centred cubic (bcc) lattice the atoms touch along the body diagonal, whose length is (a = edge length = lattice parameter) and equals . The nearest-neighbour distance (corner atom to body-centre atom) is half the body diagonal:

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Question ID VK-090170