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The rate at which a particular substance will vapourize (evaporate) when compared to the rate of a known substance such as ethyl ether. This term is especially useful for health and fire-hazard considerations.

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The most expensive metal in the world

Do you think the most expensive metal is gold? No! On earth there are more valuable metals. But we need to divide the value of metals that occur in nature, and metals - isotopes, which are obtained in special laboratories. Let’s look at natural metals first.

Background Radiation

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

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.

Levorotatory

Refers to an optically active substance that rotates the plane of plane polarized light counterclockwise, also called levo.

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Native State

Refers to the occurrence of an element in an uncombined or free state in nature.

 

Doublet

Two peaks or bands of about equal intensity appearing close together on a spectrogram.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Collision Theory

Theory of reaction rates that states that effective collisions between reactant molecules must occur in order for the reaction to occur.

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.