Caesium



cesium.
a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; atomic weight: 132.905; atomic number: 55; specific gravity: 1.9 at 20°C; melts at 28.5°C.
Historical Examples

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 4 Various
A Textbook of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer and John Jacob Beringer
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various

noun
a ductile silvery-white element of the alkali metal group that is the most electropositive metal. It occurs in pollucite and lepidolite and is used in photocells. The radioisotope caesium-137, with a half-life of 30.2 years, is used in radiotherapy. Symbol: Cs; atomic no: 55; atomic wt: 132.90543; valency: 1; relative density: 1.873; melting pt: 28.39±0.01°C; boiling pt: 671°C
noun
the usual US spelling of caesium
n.
n.
cesium
(sē’zē-əm)
Symbol Cs
A soft, ductile, silvery-white element of the alkali group. It is liquid at room temperature and is the most reactive of all metals. Cesium is used to make photoelectric cells, electron tubes, and atomic clocks. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See Periodic Table.

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