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Compounds that contain only carbon and hydrogen.

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Pairing Energy

Energy required to pair two electrons in the same orbital.

ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Element

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

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Crystalline Solid

A solid characterized by a regular, ordered arrangement of particles.

Enthalpy

The heat content of a specific amount of substance, defined as E= PV.

Effective Nuclear Charge

The nuclear charge experienced by the outermost electrons of an atom, the actual nuclear charge minus the effects of shielding due to inner-shell electrons.
Example: Set of dx2-y2 and dz2 orbitals, those d orbitals within a set with lobes directed along the x-, y-, and z-axes.

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Standard Molar Enthalphy of Formation

The amount of heat absorbed in the formation of one mole of a substance in a specified state from its elements in their standard states.

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.