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caesium

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alkali metal

Overview page. Subjects: Chemistry.

Any of five elements in Group IA of the periodic table: lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs).

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atomic clock

Overview page. Subjects: Astronomy and Astrophysics.

An apparatus for measuring or standardizing time that is based on periodic phenomena within atoms or molecules. See ammonia clock; caesium clock.

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Chernobyl

Overview page. Subjects: Environmental Science.

A town near Kiev in Ukraine where, in April 1986, an accident at a nuclear power station resulted in a serious escape of radioactive material, and the subsequent contamination of Ukraine,...

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Gustav Robert Kirchhoff

Overview page. Subjects: Astronomy and Astrophysics.

(1824–87)

Germanphysicist. With the chemist Robert Wilhelm Bunsen (1811–99) he established the principles of spectral analysis. In 1859 he reasoned that the Fraunhofer lines in the...

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nuclear waste

Overview page. Subjects: Public Health and Epidemiology.

The residue of material left over from the production of nuclear energy. This includes some ores, mine tailings, and residual products of nuclear reactions that are radioactive with an...

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Robert Wilhelm Bunsen

Overview page. Subjects: Science and Mathematics.

(1811–99) German chemist,

who held professorships at Kassel, Marburg, and Heidelberg. His early researches on arsenic-containing compounds cost him an eye in an explosion. He then...

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