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Ionic substances consist of cations with high effective nuclear charge (positively charged ions) and anions with low effective nuclear charges (negatively charged ions), this causes all the electrons in the sigma bond to be pulled towards the cation. This results in a negatively charged cation and a positively charged anion.

Once melted these ions are free to move about. As electricity is defined as a flow of charge, and these charged ions are free to flow about, the resultant melted substance will conduct electricity.

SIMPLE, when solid, ionic substances are held together very tightly, so electrons can not move. BUT, when as molten/liquid/aqueaus the bonds slacks and the electrons are FREE to move!! Therefore conducting electricity...

^_^ "hope this helps!!!"

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