Science, Tech, Math › Science If a Molecule Is Reduced Does It Gain or Lose Energy? Share Flipboard Email Print The three main components of each atom are protons, neutrons, and electrons. MARK GARLICK, Getty Images Science Chemistry Physical Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated May 06, 2019 Question: If a Molecule Is Reduced Does It Gain or Lose Energy? Answer: Reduction occurs when a molecule gains an electron or decreases its oxidation state. When a molecule is reduced, it gains energy. Does an Oxidized Molecule Gain or Lose Energy?