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Spontaneous decomposition of an atom.

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Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Acidic Salt

A salt containing an ionizable hydrogen atom. Acidic salt does not necessarily produce acidic solutions.

Radioactivity

The spontaneous disintegration of atomic nuclei.

Chain Termination Step

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

Nuclides

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

Hydrogenation

The reaction in which hydrogen adds across a double or triple bond.

Molecular Orbital

An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.

Geiger counter

A gas filled tube which discharges electriaclly when ionizing radiation passes through it.

Electronic Transition

The transfer of an electron from one energy level to another.

Oxidizing Agent

The substance that oxidizes another substance and is reduced.