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Any species that can make available a share in an electron pair.

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Accuracy

How closely a measured value agrees with the correct value.

Dubnium

Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970. Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only. Origin:The element is named after the Russian town of Dubna.

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.

Absorption Spectrum

Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Critical Point

The combination of critical temperature and critical pressure of a substance.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Half-Life

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.

Polymerization

The combination of many small molecules to form large molecules.

Radioactive Tracer

A small amount of radioisotope replacing a nonradioactive isotope of the element in a compound whose path (for example, in the body) or whose decomposition products are to be monitored by detection of radioctivity, also called a radioactive label.