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An equation of state that extends the ideal gas law to real gases by inclusion of two empirically determined parameters, which are different for different gases.

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Heat of Crystallization

The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature.

yttrium metal

Any of a subgroup of rare-earth elements, of which the cerium and terbium metals comprise the other two subgroups.

Excited State

Any state other than the ground state of an atom or molecule.

Amphiprotism

Ability of a substance to exhibit amphiprotism by accepting donated protons.

Clay

A class of silicate and aluminosilicate minerals with sheet-like structures that have enormous surface areas that can absorb large amounts of water.

Mother Nuclide

Nuclide that undergoes nuclear decay.

Compressed Gas

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

Optical Activity

The rotation of plane polarized light by one of a pair of optical isomers.

 

Antibonding Orbital

A molecular orbital higher in energy than any of the atomic orbitals from which it is derived, lends instability to a molecule or ion when populated with electrons, denoted with a star (*) superscript or symbol.

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.