Question

Find the number of corner of O-atom shared per tetrahedron in 3D-silicate.

Answer 1

Four corner O-atoms are shared per tetrahedron in 3D-silicate. This results in formation of infinite thre dimensional network of repating unit of $Si{O}_2$. Since, all the four oxygen atoms are bridged atoms, none of them have negative charge. Hence, 3D silicates are neutral.