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10.3 Representing Valence Electrons with Dots -- Part 2
It takes a lot of heat to melt the solid.
The model shows that the electrons are transferred from the metal to the nonmetal on one atom.
Our model doesn't include any free electrons that can move or flow in response to an electric potential.
Our model accounts for the nonconductivity of ionic solids because the ion themselves are fixed in place.
The cations and anions form free ion in solution when our ionic solid is dissolved in water.
The ion can move in response to electrical forces.
Our model predicts that solutions of ionic compounds conduct electricity.
Ions are fixed.
The anions and cations are in a lattice.
The melting points of ionic compounds are high.
Aqueous salt conducts electricity.
The ion have larger charges than the MgO.
The ion have smaller charges than the MgO, so it has a higher melting point.
The NaCl has a higher melting point.
NaCl has a higher melting point because it has smaller charges.
A number of ionic compounds have medical uses.
Consider the list of ionic compounds used in medicine.
Many of these compounds contain polyatomic ion.
A metal and a polyatomic ion bonding is ionic.
The topic of our next section is the bonding within a polyatomic ion.
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