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Crystal field designation for an outer orbital complex, all t2g and eg orbitals are singly occupied before any pairing occurs.

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Hydrate

A solid compound that contains a definite percentage of bound water.

Alpha Particles

A helium nucleus.

Quantum Mechanics

Mathematical method of treating particles on the basis of quantum theory, which assumes that energy (of small particles) is not infinitely divisible.

Mixture

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

Percent Composition

The mass percent of each element in a compound.

Electrical Conductivity

Ability to conduct electricity.

Rate-determining Step

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

Born-Haber Cycle

A series of reactions (and accompanying enthalpy changes) which, when summed, represents the hypothetical one-step reaction by which elements in their standard states are converted into crystals of ionic compounds (and the accompanying enthalpy changes.)

Cloud Chamber

A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

Anode

In a cathode ray tube, the positive electrode. Electrode at which oxidation occurs.