Which of the following elements exhibit metallic nature among $C$,$Si$,$Ge$,$Sn$,and $Pb$?

Silicon is an important constituent of

Provide information about silicon compounds (silicates).

Which of the following statements are correct?
$I)$ $SnF_4$ is ionic in nature.
$II)$ Stability of dihalides of group $14$ elements increases down the group.
$III)$ $GeCl_2$ is more stable than $GeCl_4$.

Number of oxygen atoms present in the chemical formula of fuming sulphuric acid is . . . . .

The basic structural unit of silicates is