n → π* state, 977 n → π* transition, 978 n → σ* transition, 978 n-σ* delocalization (or n-σ* no bond resonance) , 978 nano, 978 nanocomposite, 978 nanodomain morphology, 979 nanofiltration, 979 nanogel, 979 nanoscopic film, 979 naphthenes [obsolete] , 979 naphthenic acids [obsolete] , 979 narcissistic reaction [obsolete] , 980 natural atomic orbital (NAO), 980 natural bond orbital (NBO), 980 natural broadening of a spectral line , 981 natural graphite, 981 natural hybrid orbital (NHO), 981 natural isotopic abundance, 981 natural orbital, 981 natural population analysis (NPA), 982 natural radiation, 982 natural radioactivity, 982 necrosis, 983 needle coke, 983 negative adsorption, 983 negative hyper-conjugation, 983 negative ion in mass spectrometry, 984 negaton, 984 neighbouring group participation, 984 neodymium laser, 985neper , 985 nephelometry, 985 Nernst’s diffusion layer, 985 net current, 986 net electric charge, of a particlein electrophoresis , 986 net in surface chemistry , 986 net shaping, 987 network, 987 network defect, 987 network in polymer chemistry , 987 network polymer, 988 network-chain molar mass, , 988 neutralized gel, 988 neutrino (electron neutrino), 988 neutron, 989 neutron density, 989 neutron multiplication, 989 neutron number, , 989 neutron rest mass, 989 neutron temperature, 989 neutrophilic organisms, 990