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The time required for half of a reactant to be converted into product(s). The time required for half of a given sample to undergo radioactive decay.

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Melting Point

The temperature at which liquid and solid coexist in equilibrium, also the freezing point.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Strong Field Ligand

Ligand that exerts a strong crystal or ligand electrical field and generally forms low spin complexes with metal ions when possible.

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.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Mechanism

The sequence of steps by which reactants are converted into products.

Nucleons

Particles comprising the nucleus, protons and neutrons.

Electromotive Series

The relative order of tendencies for elements and their simple ions to act as oxidizing or reducing agents, also called the activity series.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.