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

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Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Electronic Transition

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

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Pineapple literally "erodes" the tongue

Everyone who has ever tried fresh pineapple knows that if you eat too much, your lips and tongue hurt for a while. This is because the pineapple contains an enzyme called bromelain. This enzyme literally "erodes" the tongue.

Homonuclear

Consisting of only one element.

Solubility Product Constant

Equilibrium constant that applies to the dissolution of a slightly soluble compound.

Extensive Property

A property that depends upon the amount of material in a sample.

Ore

A natural deposit containing a mineral of an element to be extracted.

Oxide

A binary compound of oxygen.

Background Radiation

Ratiation extraneous to an experiment. Usually the low-level natural radiation form cosmic rays and trace radioactive substances present in our environment.