In a chemical reaction, which electrons participate directly in bonding?

• A. Core Electrons
• B. Valence Electrons
• C. Protons
• D. Neutrons

Answer: (B)

Bonding happens with the outer electrons. The outermost electrons, known as valence electrons, are the ones that can be shared or transferred between atoms to form bonds. They have energies that allow interaction with electrons from other atoms, and their number largely determines how many bonds an atom can make and its chemistry. Core electrons are inner-shell electrons that are held tightly and shielded by others, so they stay with the atom and don’t typically participate in bond formation. Protons and neutrons reside in the nucleus and don’t participate in chemical bonding; bonding involves rearranging electrons around the nucleus, not changing the nucleus itself. So valence electrons are the ones that directly participate in bonding.