In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: The transfer of these particles is central to Marcus theory, and they are emitted in the Auger [oh-ZHEY] effect. Nitro and cyano groups "withdraw" these particles from conjugated systems. The solvated type of these particles are responsible for the blue color when sodium is dissolved in liquid ammonia. Robert Millikan measured the charge of these particles in the oil drop experiment. Reducing agents can cause other substances to gain these particles, which are depicted in Lewis dot structures. For 10 points, name these negatively charged particles that orbit the nucleus.
A:
Science