(D) The basic structural unit of all silicates is the $SiO_4^{4-}$ tetrahedron,in which one silicon atom is bonded to four oxygen atoms in a tetrahedr

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(D) The basic structural unit of all silicates is the $SiO_4^{4-}$ tetrahedron,in which one silicon atom is bonded to four oxygen atoms in a tetrahedral arrangement.This unit is derived from silicic acid,$H_4SiO_4$,by the removal of four protons ($H^+$ ions) as shown in the reaction:$H_4SiO_4 \rightarrow SiO_4^{4-} + 4H^+$