The common basic structural unit in silicates and silica is-

• A. Si₂O₆⁴⁻
• B. SiO₃²⁻
• C. SiO₄⁴⁻
• D. Si₂O₇⁶⁻

The common basic structural unit in silicates and silica is SiO₄⁴⁻. This tetrahedral structure consists of one silicon atom surrounded by four oxygen atoms, forming the fundamental building block for many silicate minerals.

Understanding Silicate Structures

Silicates are a large group of minerals that contain silicon and oxygen. The arrangement of these atoms leads to various forms and properties of silicate minerals.

Key Points About SiO₄⁴⁻

• It forms a tetrahedron, which is a three-dimensional shape with four triangular faces.
• This unit can link with other tetrahedra to create different silicate structures, such as chains, sheets, or frameworks.
• Silicates are the most abundant minerals in the Earth's crust, largely due to the stability of the SiO₄⁴⁻ unit.