How many corners of $\mathrm{SiO}_4$ units are shared in the formation of three dimensional silicates?
How many corners of $\mathrm{SiO}_4$ units are shared in the formation of three dimensional silicates?
$3$
$2$
$4$
$1$
Solution
If all the four corners, i.e., all the four oxygen atoms of each tetrahedra $\left(\mathrm{SiO}_4\right)$ are shared with other tetrahedra, three-dimensional network structure is obtained. i.e., different forms of silica such as quartz, tridymite and crystobalite.