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A group of atoms that represents a potential reaction site in an organic compound.

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Hybridization

Mixing a set of atomic orbitals to form a new set of atomic orbitals with the same total electron capacity and with properties and energies intermediate between those of the original unhybridized orbitals.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Positron

A Nuclear particle with the mass of an electron but opposite charge.

Weak Electrolyte

A substance that conducts electricity poorly in a dilute aqueous solution.

Yellowcake

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

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Coordination Number

In describing crystals, the number of nearest neighbours of an atom or ion. The number of donor atoms coordinated to a metal.

Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Ether

Compound in which an oxygen atom is bonded to two alkyl or two aryl groups, or one alkyl and one aryl group.

Enantiomer

One of the two mirror-image forms of an optically active molecule.