Native Elements Nearly pure elements occurring naturally in the earth's crust
Natural law a statement that expresses generally observed behavior
Nernst equation an equation relating the potential of an electrochemical cell to the concentrations of the cell components
Neutralization reaction an acid-base reaction
Neutrino A very small particle emitted along with a positron
Neutron a particle in the atomic nucleus with mass virtually equal to the proton's but with no charge
Net ionic equation an equation for a reaction in solution, where strong electrolytes are written as ions, showing only those components that are directly involved in the chemical change
Network solid an atomic solid containing strong directional covalent bonds
Nitride salt a compound containing the N3- anion
Nitrogen cycle the conversion of N2 to nitrogen-containing compounds, followed by the return of nitrogen gas to the atmosphere by natural decay processes
Nitrogen fixation the process of transforming N2 to nitrogen-containing compounds useful to plants
Noble gas Group 8A element
Node an area of an orbital having zero electron probability
Nonelectrolyte a substance which, when dissolved in water, gives a nonconducting solution
Nonmetal n element not exhibiting metallic characteristics Chemically, a typical nonmetal accepts electrons from a metal
Nonpolar Covalent Bond A covalent bond in wbich the electron pair is shared equally between atoms having the same electronegativity
Nonradiative Transition Energy transfer from excited-state molecules through collision with other molecules rather than through radiation of energy
Normal boiling point the temperature at which the vapor pressure of a liquid is exactly one atmosphere
Normal melting point the temperature at which the solid and liquid states have the same vapor pressure under conditions where the total pressure on the system is one atmosphere
Normality the number of equivalents of a substance dissolved in a liter of solution
Nuclear atom an atom having a dense center of positive charge (the nucleus) with electrons moving around the outside
Nuclear Fission The cleavage of a heavy nucleus into two nuclei of intermediate mass
Nuclear Fusion The combination of low-mass atomic nuclei into heavier nuclei
Nuclear Reactor Equipment for carrying out controlled nuclear fission reactions, usually used to generate power
Nuclear transformation the change of one element into another
Nucleon a particle in an atomic nucleus, either a neutron or a proton
Nucleotide a monomer of the nucleic acids composed of a five-carbon sugar, a nitrogen-containing base, and phosphoric acid
Nucleus the small, dense center of positive charge in an atom
Nuclide Any isotope of any element

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