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Si
SiO2
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https://lh7-us.googleusercontent.com/XTXz__FuvTYlDGUUHTSlQR2R75aONBxozMaTmoK9onghv-f81jzWGohtgVL9nC1ip01mu-WaNfMEcQrYLPKcvGl6tyHP-ZpKNQQbbnAyqjUZGg8WN2eyCyR-UZCwhtZRbypI13ekpvBJx9CI8gePyF8
https://lh7-us.googleusercontent.com/f-Is4WyAMWmChznUfl2sgSHTFSElz4tztH9MQoxYah38zNjzJCtxZ92Fkv-dWsOvBdR9MyMbx_qra9kmcIfGmWwXwHTNhGIs3uqMXrF1kPe7VxuevvjfbCB0K650fP7Np_tC2gA2QVnJD8iZWo81jdM
Silicon atoms are arranged in the same way as the carbon atoms are in diamond, however silicon: Does not show allotropic behaviour Is weaker than diamond
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Each silicon is bonded to 4 oxygen/ each oxygen bonded to 2 silicon/ ratio of Si and O is 1:2 1. strong  2. insoluble in water  3. high melting point  4. non-conductor of electricity