Which of the following statements is true regarding the nature of electrons?

Electrons are indeed subatomic particles that have a negative electric charge and are primarily located in quantum shells or energy levels surrounding the nucleus of an atom. The concept of quantum shells refers to the discrete energy levels within which electrons can exist; these shells are defined by quantum mechanics and are critical for understanding electron configuration in an atom.

Electrons do not reside in the nucleus; rather, they occupy the space around it, contributing to the chemical behavior of atoms. Each quantum shell can hold a certain number of electrons, and electrons in the outermost shell play a key role in chemical bonding and reactivity. Thus, stating that electrons revolve around the nucleus in quantum shells accurately captures their behavior within an atom. Understanding this concept is essential for further studies in atomic structure and chemical interactions.