caesium
n. soft metallic element (Chemistry) | ||||
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Caesium definition was found in categories: Language, Idioms & Slang(2) Science & Technology(1) Encyclopedia(1)
Caesium Definition from Language, Idioms & Slang Dictionaries & Glossaries
| Webster's Revised Unabridged Dictionary (1913) |
Caesium
(n.)
A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6.
(n.)
A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6.
| WordNet 2.0 |
caesium
Noun
1. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
(synonym) cesium, Cs, atomic number 55
(hypernym) metallic element, metal
(hyponym) cesium 137
(substance-holonym) pollucite
Noun
1. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
(synonym) cesium, Cs, atomic number 55
(hypernym) metallic element, metal
(hyponym) cesium 137
(substance-holonym) pollucite
Caesium Definition from Science & Technology Dictionaries & Glossaries
| Chemistry of the Elements |
Caesium
Name: caesium
Symbol: Cs
Atomic number: 55
Atomic weight: 132.90545 (2)
Group in periodic table: 1
Group name: Alkaline metal
Period in periodic table: 6
Block in periodic table: s-block
CAS registry ID: 7440-46-2
Caesium is known as cesium in the USA.
The metal is characterised by a spectrum containing two bright lines in the blue (accounting for its name). It is silvery white, soft, and ductile. It is the most electropositive and most alkaline element. Caesium, gallium, and mercury are the only three metals that are liquid at or around room temperature. Caesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Caesium hydroxide is a strong base and attacks glass.
Name: caesium
Symbol: Cs
Atomic number: 55
Atomic weight: 132.90545 (2)
Group in periodic table: 1
Group name: Alkaline metal
Period in periodic table: 6
Block in periodic table: s-block
CAS registry ID: 7440-46-2
Caesium is known as cesium in the USA.
The metal is characterised by a spectrum containing two bright lines in the blue (accounting for its name). It is silvery white, soft, and ductile. It is the most electropositive and most alkaline element. Caesium, gallium, and mercury are the only three metals that are liquid at or around room temperature. Caesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Caesium hydroxide is a strong base and attacks glass.
Caesium Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Caesium
Caesium (also spelled cesium, IPA: ) is a chemical element in the periodic table that has the symbol Cs and atomic number 55. It is a soft silvery-gold alkali metal with a melting point of 28 °C (83 °F) which makes it one of the metals that are liquid at or near room temperature along with rubidium (39°C), francium (27 °C), mercury (-39 °C), and gallium (30 °C). This element is most notably used in atomic clocks.
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