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One twelfth of a mass of an atom of the carbon-12 isotope, a unit used for stating atomic and formula weights, also called dalton.

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Electrode Potentials

Potentials, E, of half-reactions as reductions versus the standard hydrogen electrode.

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Band of Stability

Band containing nonradioactive nuclides in a plot of number of neutrons versus atomic number.

Isomers

Different substances that have the same formula.

Displacement Reactions

Reactions in which one element displaces another from a compound.

 

Natural Radioactivity

Spontaneous decomposition of an atom.

Ion

An atom or a group of atoms that carries an electric charge.

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Polyene

A compound that contains more than one double bond per molecule.

Matter

Anything that has mass and occupies space.