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The intermetallic compound LiAg forms a cubic lattice where each lithium and silver atom is surrounded by eight neighboring atoms. Which type of cubic unit cell does this structure represent?

1. Primitive cubic
2. Cubic with atoms at faces
3. Cubic with atoms at body center
4. Not part of any cubic category

Correct answer: Cubic with atoms at body center

Solution

In a body-centred cubic (BCC) lattice, each atom has a coordination number of 8, which matches the description of the LiAg structure. Hence, the unit cell belongs to the BCC class.

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