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It is impossible to determine accurately both the momentum and position of an electron simultaneously.

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Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Open Sextet

Refers to species that have only six electrons in the highest energy level of the central element (many Lewis acids).

Periodicity

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

Alpha Particles

A helium nucleus.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Optical Isomers

Stereoisomers that differ only by being nonsuperimposable mirror images of each other, like right and left hands, also called enantiomers.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Element

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

Basic Anhydride

The oxide of a metal that reacts with water to form a base.