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1.what properties of ionic compounds suggest that ionic bond

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1.what properties of ionic compounds suggest that ionic bonds are strong
2.what types of elements form ionic bonds with each other
4.what is the minimum number of different ions in the formula of an ionic compound?explain
蒽……我是想知道这些的答案
1.a.high melting and boiling point;
b.good electrical conductivity when molten or in aqueous solution;
2.Metal and nonmetal elements.
4.Two.One positively charged and on negatively charged,such as sodium chloride.