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An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

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Dilution

Process of reducing the concentration of a solute in solution, usually simply by mixing with more solvent.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Avogadro's Law

At the same temperature and pressure, equal volumes of all gases contain the same number of molecules.

Primary Standard

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

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Percentage Ionization

The percentage of the weak electrolyte that ionizes in a solution of given concentration.

Cathode Ray Tube

Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.