What is the term for the method of joining atoms to form molecules?

The term "bonds" refers to the fundamental interactions that hold atoms together to form molecules. These bonds arise when atoms share or transfer electrons, leading to various types of molecular formations. Different types of bonds, such as covalent, ionic, and hydrogen bonds, play crucial roles in determining the structure and properties of molecules.

Understanding the concept of bonding is essential because the way atoms connect influences the behavior of substances, including chemical reactions and stability. In the context of hair coloring, this knowledge is particularly relevant, as the molecular structure of hair and the dyeing agents can affect the outcome of hair treatments and the permanence of color.

The other options pertain to different aspects related to hair coloring and chemistry but do not define the interaction between atoms. "Brassy tones" relate to unwanted color shifts in hair, "build up" refers to the accumulation of products on hair, and "bleeding" describes the unintended spread of color during or after a coloring process. None of these terms convey the core principle of molecular bonding.