Matching Pairs Bio Matching 4Online version Bio Matching 4 by Lewis Morris 1 Electron Donor 2 Electron 3 Electron Carrier 4 Electromagnetic Spectrum 5 Electric Potential 6 Electron Shell 7 Electrochemical Gradient 8 Electron Acceptor Any of various molecules that are capable of accepting one or two electrons from one molecule and donating them to another in the process of electron transport. An electron donor is a chemical entity that donates electrons to another compound. The amount of work needed to move a unit charge from a reference point to a specific point against an electric field. An electron shell is the outside part of an atom around the atomic nucleus. It is a group of atomic orbitals with the same value of the principal quantum number n. A chemical entity that accepts electrons transferred to it from another compound. It is an oxidizing agent that, by virtue of its accepting electrons, is itself reduced in the process. A gradient of electrochemical potential, usually for an ion that can move across a membrane. The collective term for all possible frequencies of electromagnetic radiation. A subatomic particle with a negative elementary electric charge.