Silicates Notes for class 11 Chemistry
class 11 chemistry Notes Silicates Binary compounds of silicon with oxygen are called silicates but they contain other metals also in their structures. (i) Since the electronegativity difference between O & Si is about 1.7, so Si–O bond can be considered 50% ionic & 50% covalent. (ii) If we calculate the radius ratio then,r Si 4+ /r O 2- = 0.29 It suggests that the coordination number of silicon must be 4 and from VBT point of view we can say that Si is sp 3 hybridized. Therefore silicate structures must be based upon SiO 4 4– tetrahedral units. (iii) SiO 4 4– tetrahedral units may exist as discrete units or may polymerise into larger units by sharing corners. ...

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