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 X, Y, and Z as metallic, ionic, network, or molecular solids.

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Substance Appearance X Y N brittle, white very hard, colorless hard, orange Melting Electrical Solubility conductivity point/°C in water 146 1600 398 none none only when dissolved in water soluble insoluble soluble