Three unknown substances were tested in order to classify them. The following table shows the results of the tests. Use Table 3H.1 to classify substances A, B, and C as metallic, ionic, network, or molecular solids.

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Substance Appearance hard, white A B C lustrous, malleable soft, yellow Melting point/°C 800 Electrical Solubility conductivity in water soluble only when dissolved in water 1500 high 113. none insoluble insoluble