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The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point

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Nodal Plane

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

 

Coulomb

Unit of electrical charge.

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.

Isomorphous

Refers to crystals having the same atomic arrangement.

Nucleus

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

Contact Process

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

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Standard Electrodes

Half-cells in which the oxidized and reduced forms of a species are present at unit activity, 1.0M solutions of dissolved ions, 1.0atm partial pressure of gases, and pure solids and liquids.

Matter

Anything that has mass and occupies space.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.