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Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Every chemical element has absorption lines at certain wavelengths corresponding to the differences between the energy levels of its atomic orbitals.

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Yellowcake

The solid form of mixed uranium oxide, which is produced from uranium ore in the uranium recovery (milling) process.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Alkylbenzene

A compound containing an alkyl group bonded to a benzene ring.

Accuracy

How closely a measured value agrees with the correct value.

Homonuclear

Consisting of only one element.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Polar Bond

Covalent bond in which there is an unsymmetrical distribution of electron density.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.