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- Nernst equation
- The relationship between the standard cell potential and the cell potential under conditions of other concentrations and temperatures.
- net ionic equation
- The equation for a reaction in which strong electrolytes are written as their separate component ions and in which ions that are unchanged are omitted.
- network covalent solid
- A substance in which covalent bonds join atoms in a structure that extends indefinitely.
- neutralization reaction
- The reaction of an acid with a base to form water and a salt.
- neutron
- The uncharged particle in an atomic nucleus; its mass is similar to the mass of a hydrogen atom.
- noble gas
- One of the elements in the same column of the periodic table as helium; also called inert gas.
- nomenclature
- A system of names for identifying elements, ions, and compounds.
- non-stoichiometric
- Describing a compound for which the chemical formula varies over a limited range.
- nonbonding molecular orbital
- An orbital formed by the overlap of atomic orbitals having symmetry leading to no net overlap; comparable in energy to the atomic orbitals from which it is formed.
- nonbonding pair
- In a covalently bonded molecule or ion, a pair of electrons not involved in the formation of bonds.
- nonmetal
- An element that is not a metal; such elements include hydrogen and those in the upper right of the periodic table.
- nonpolar
- Describing a molecule having no separation of centers of positive and negative electrical charge that would make the molecule assume certain orientations more than others in an electric field.
- normal boiling point
- The temperature at which the vapor pressure of a liquid reaches a pressure of one atmosphere.
- normality
- The molarity of a solution multiplied by the number of moles of that substance that occur in a chemical equation.
- nuclear binding energy
- The energy released as particles are brought together to form a nucleus.
- nuclear reactor
- A device for obtaining energy from a sustained fission (or, perhaps in the future, fusion) reaction.
- nucleic acid
- A biological polymer composed of nucleotides; DNA and RNA are nucleic acids.
- nucleophile
- A species that in its reactions seeks positive charge; bases are typically nucleophiles.
- nucleotide
- One of the organic base-sugar-phosphate combinations that is a monomer for DNA or RNA.
- nucleus
- The massive collection of protons and neutrons at the center of an atom.
- nuclide
- An atom having a set number of protons and neutrons.
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