BIOB34H3 Chapter 2: CHAPTER 2.docx
Document Summary
Atoms are composed of protons, neutrons, and electrons. Electrons form bonds between atoms and capture energy. Isotopes contain different number of neutrons: covalent bonds. Cation-positively charged ion: high-energy electrons electrons in certain atoms can capture energy from their environment and transfer it to other atoms, free radicals unstable atoms resulting radiation that alters the distribution of electrons in atoms. Antioxidants substances that prevent damage to our cells by giving up electrons without becoming free radicals. Covalent bonds are formed when adjacent atoms share electrons.