 | Caesium (IUPAC spelling; cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali... 88 KB (9,727 words) - 22:56, 14 April 2024 |
Caesium (55Cs) has 41 known isotopes, the atomic masses of these isotopes range from 112 to 152. Only one isotope, 133Cs, is stable. The longest-lived... 27 KB (1,862 words) - 09:53, 21 January 2024 |
 | Caesium-137 (137 55Cs ), cesium-137 (US), or radiocaesium, is a radioactive isotope of caesium that is formed as one of the more common fission products... 35 KB (3,745 words) - 10:55, 14 April 2024 |
 | The caesium standard is a primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133... 21 KB (2,486 words) - 18:07, 9 July 2023 |
 | Francium (redirect from Eka-caesium) 22 minutes. It is the second-most electropositive element, behind only caesium, and is the second rarest naturally occurring element (after astatine)... 36 KB (4,002 words) - 09:39, 18 April 2024 |
 | Second (redirect from 9192631770 cycles of a Caesium atomic clock) fixed numerical value of the caesium frequency, ΔνCs, the unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9192631770... 34 KB (3,637 words) - 11:40, 28 March 2024 |
 | Caesium chloride or cesium chloride is the inorganic compound with the formula CsCl. This colorless salt is an important source of caesium ions in a variety... 39 KB (3,395 words) - 06:46, 20 March 2024 |
 | chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). Together with hydrogen they constitute group 1... 214 KB (23,323 words) - 02:15, 21 March 2024 |
| Atomic clock (section Caesium) of the caesium frequency, ΔνCs{\displaystyle \Delta \nu _{\text{Cs}}}, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom... 144 KB (15,365 words) - 19:57, 15 April 2024 |
 | Caesium fluoride or cesium fluoride is an inorganic compound with the formula CsF and it is a hygroscopic white salt. Caesium fluoride can be used in... 10 KB (890 words) - 06:30, 29 February 2024 |