Concept explainers
(a)
Interpretation:
Atoms present in unit of polonium have to be determined.
Concept Introduction:
Unit cell represents lattice structure if it stacked together repeatedly with no gaps and rotations. This can also produce whole crystals by stacking method. Basic type of unit cells is as follows:
1. Simple cubic (SC).
2. Body centered cubic (BCC).
3. Face centered cubic (FCC).
(b)
Interpretation:
Coordination number for structure type of polonium has to be determined.
Concept Introduction:
Radius ratio of smaller ion to larger ion in solid state is used to represent relative size of larger ion. This radius ratio is used to predict structure of unit cell from crystal lattice as follows:
(c)
Interpretation:
Length of side of unit cell of polonium has to be determined.
Concept Introduction:
Refer to part (a).
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