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A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.

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Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Lewis Acid

Any species that can accept a share in an electron pair.

Ozone

We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Cohesive Forces

All the forces of attraction among particles of a liquid.

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Haber Process

A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

Primary Standard

A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.

Aryl Group

Group of atoms remaining after a hydrogen atom is removed from the aromatic system.

Integrated Rate Equation

An equation giving the concentration of a reactant remaining after a specified time, has different mathematical form for different orders of reactants.