Science / Geology / Ion: An atom or group of atoms that have gained or lost one or more electron and as a result has an electrical charge.
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Polyatomic Ion

Science / Chemistry / Polyatomic Ion: A polyatomic ion is a charged particle that contains more than two covalently bound atoms. See Polyatomic Ions for more. MORE

Ion Exchange

Science / Chemistry / Ion Exchange: Ion exchange is a method of separating ions from a solution by reversibly binding them onto a resin that has charged sites on its surface. Ion exchangers are used to remove metal ions from drinking wa MORE


Science / Biology / Oxidation: The loss of electrons from the outer shell of an atom; often accompanied by the transfer of a proton and thus involves the loss of a hydrogen ion. The loss of electrons or hydrogens in a chemical reac MORE

Oxidation Half Reaction

Science / Chemistry / Oxidation Half Reaction: That part of a redox reaction that involves loss of electrons. In the oxidation half reaction, the oxidation number of one or more atoms within the reactants is increased. MORE

Oxidation Number

Science / Chemistry / Oxidation Number: A convention for representing a charge of an atom embedded within a compound, if the compound were purely ionic. For example, H2O is a covalent compound; if it were ionic, the hydrogens would be H+ (o MORE

Oxygen Dissociation Curve

Science / Marine Biology / Oxygen Dissociation Curve: A curve showing the percent saturation of a blood pigment, such as hemoglobin, as a function of oxygen concentration of the fluid MORE