Final answer:
The choice NOT a representative particle is the electron. Representative particles include molecules, atoms, and ions (cations and anions), whereas electrons are fundamental particles classified as leptons. Therefore correct option is C
Step-by-step explanation:
The choice that is NOT a representative particle is c. Electron. Representative particles include molecules, atoms, and ions such as cations and anions. A representative particle is used to represent the smallest unit that retains the identity and composition of the substance in bulk matter, whether it's a single atom in elements, a molecule in covalent compounds, or formula units in ionic compounds.
An electron is a fundamental particle, classified as a lepton, that exists in the cloud around the nucleus of an atom. An atom that has an electrical charge due to having an unequal number of electrons to protons is considered an ion, with negatively charged ions known as anions, which have more electrons than protons. An atom can also lose electrons to become a positively charged cation.