On the analysis of the structure of a substance
If you want to understand the shape and structure of a substance, you must study the arrangement of its atoms and the degree of bond angles in detail. Take AlF
as an example, this is a common substance in chemistry.

In AlF <, aluminum (Al) is the central atom. Its outer electronic structure gives aluminum a unique performance when bonding. Fluorine (F) atoms surround aluminum atoms and are connected by chemical bonds.

Looking at its molecular geometry, due to the mutual exclusion theory of the valence layer electron pairs of aluminum atoms, electron pairs tend to move away from each other to reach the lowest energy state. In AlF
, the electron pairs around aluminum atoms are uniformly distributed in the shape of a plane triangle. The fluorine atom is located at the three vertices of the triangle, and the aluminum atom is at the center.

The bond angle is also the key to the study of molecular geometry. In AlF, the bond angle between each fluorine atom and the aluminum atom is about 120 °. The formation of this angle is the result of the mutual repulsion of electron pairs. Such bond angles and molecular geometry endow AlF with specific physical and chemical properties.

All of these need to be explored with scientific methods and rigorous thinking in order to clarify the mystery of the molecular geometry of matter, which is of great significance in the research, engineering, and application of chemistry.