* Chemical Reactions Involve Electron Exchange: Chemical reactions fundamentally involve the sharing, gaining, or losing of electrons between atoms. These changes in electron configuration create new chemical bonds or break existing ones.
* Electrons Determine Reactivity: The arrangement of electrons in an atom's outermost shell (valence electrons) determines its reactivity. Atoms with incomplete valence shells tend to participate in reactions to achieve stability.
* Enzymes as Catalysts: Enzymes, the biological catalysts that speed up reactions in cells, often work by manipulating the electrons involved in a reaction. They can lower the activation energy required for a reaction to proceed by providing alternative electron pathways.
Other Subatomic Particles and Their Roles:
* Protons: Determine the element's identity and contribute to the atom's overall charge. They are not directly involved in the majority of chemical reactions.
* Neutrons: Contribute to the atom's mass and stability. They don't directly participate in chemical reactions.
In essence, the dynamic movement and sharing of electrons are the driving force behind the vast majority of chemical reactions that occur within cells.
