Electrons electron 50 article 44 chemistry 40 Protons 24 Approximation theory 22 Ground state 22 Ionization 22 Quantum theory 22 Ions 20 Mathematical models 20 Oxidation-Reduction 20 Quantum Theory 20 oxidation reduction reaction 20 Carrier concentration 18 Electrodes 18 Electron emission 18 Impact ionization 18 Kinetics 18 electron transport 18 quantum theory 18 Atoms 16 Hamiltonians 16 High energy physics 16 Molecular dynamics 16 Positrons 16 chemical structure 16 metabolism 16 unclassified drug 16 Chemical bonds 14