5005 Blue Notes Practice Test 2026 - Free Blue Notes Practice Questions and Study Guide

Electrons are the subatomic particles that occupy electron shells outside the nucleus and participate in chemical bonding. Their negative charge and arrangement in orbitals around the nucleus determine how atoms interact, share, or transfer electrons to form bonds. Protons and neutrons stay inside the nucleus and don’t form bonds with other atoms in typical chemistry; they contribute to the atom’s identity and mass but not to the bonding processes. Quarks are the even smaller constituents inside protons and neutrons and don’t directly drive chemical bonding between atoms. So, electrons are the ones that sit in the outer shells and drive chemical bonding.