Predict coordination number of the cation in crystals of the following compounds:
1. \( \mathrm{...
Predict coordination number of the cation in crystals of the following compounds:
1. \( \mathrm{MgO}: r_{c}=0.65 \AA ; r_{a}=1.40 \AA \),
2. \( \mathrm{MgS}: r_{c}=0.65 \AA ; r_{a}=1.84 \AA \)
(a) 6,4
(b) 4, 6
(c) 3,4
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