
1) Atomic number 55 2) Caesium 3) Electropositive element 4) Element discovered in 1860 5) Element in atomic clocks 6) Element number 55 7) Element used in atomic clocks 8) Element with the symbol Cs 9) Highly reactive metal 10) Metal 11) Metal in atomic clocks 12) Metallic element 13) Photoelectric cell element
Found on
https://www.crosswordclues.com/clue/cesium

1) Caesium 2) Cs
Found on
https://www.crosswordclues.com/clue/cesium

chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered ... [12 related articles]
Found on
http://www.britannica.com/eb/a-z/c/48

<element> A radioactive alkaline (basic) metal element that becomes liquid at slightly above room temperature, it reacts violently with both water and oxygen, as well as with other substances. ... (09 Oct 1997) ...
Found on
http://www.encyclo.co.uk/local/20973

(Cs) (se´ze-әm) a chemical element, atomic number 55, atomic weight 132.905.
Found on
http://www.encyclo.co.uk/local/21001
(Cs) Type: Term Pronunciation: sē′zē-ŭm Definitions: 1. A metallic element, atomic no. 55, atomic wt. 132.90543; a member of the alkali metal group. 137Cs (half-life equal to 30.1 years) is used in the treatment of certain malignancies.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=16383

[
n] - a soft silver-white ductile metallic element (liquid at normal temperatures)
Found on
http://www.webdictionary.co.uk/definition.php?query=cesium

Chemical Cs. A silver-white metal refined from pollucite ore, usually as a co-product in the processing of titanium, beryllium, or lithium minerals. Cesium ignites when exposed to air; has a 28.5 degree F melting point; used in making specialized energy converters and electric power generators.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
caesium noun a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
Found on
https://www.encyclo.co.uk/local/20974

a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; at. wt.: 132.905; at. no.: 55; sp. gr.: 1.9 at 20°C; melts at 28.5°C.
Found on
https://www.infoplease.com/dictionary/cesium
No exact match found.