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A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.

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Electrophoresis

A technique for separation of ions by rate and direction of migration in an electric field.

Mass

A measure of the amount of matter in an object. Mass is usually measured in grams or kilograms.

Barometer

A device for measuring pressure.

Lanthanide Contraction

A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.

Geometrical Isomers

Compounds with different arrangements of groups on either side of a bond with restricted rotation, such as a double bond or a single bond in a ring, for example cis-trans isomers of certain alkenes. Stereoisomers that are not mirror images of each other, also known as position isomers.

Line Spectrum

An atomic emission or absorption spectrum.

Polydentate

Refers to ligands with more than one donor atom.

Insulator

Poor electric and heat conductor.

Heisenberg Uncertainty Principle

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

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.