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The sum of the numbers of protons and neutrons in an atom, an integer.

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Matter

Anything that has mass and occupies space.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

xenon

A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

Dosimeter

A small, calibrated electroscope worn by laboratory personnel and designated to detect and measure incident ionizing radiation or chemical exposure.

Element

A substance that cannot be decomposed into simpler substances by chemical means.

Combination Reaction

Reaction in which two substances (elements or compounds) combine to form one compound.

Explosive

A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Supercritical Fluid

A substance at temperature above its critical temperature.

Atomic Mass Unit (amu)

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.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Accuracy

How closely a measured value agrees with the correct value.

Pairing Energy

Energy required to pair two electrons in the same orbital.

Nuclear Binding Energy

Energy equivalent of the mass deficiency, energy released in the formation of an atom from the subatomic particles.

 

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Third Law of Thermodynamics

The entropy of a hypothetical pure, perfect, crystalline sustance at absolute zero temperature is zero.

Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.