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Powdered MgF2 is a solid ionic compound. In solid state, there is no movement of free moving ions or electrons thus no flow of current is allowed.
2 ways to conduct electricity: 1. Dissolve MgF2 in water, form an aqueous solution of MgF2.
2. Heat powdered MgF2/Replace Powdered with molten MgF2.
2. Heat powdered MgF2/Replace Powdered with molten MgF2.