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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...
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Caesium (55Cs) has 41
known isotopes, the
atomic m****es of
these isotopes range from 112 to 152. Only one isotope, 133Cs, is stable. The longest-lived...
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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...
- The
caesium standard is a
primary frequency standard in
which the
photon absorption by
transitions between the two
hyperfine ground states of
caesium-133...
- 22 minutes. It is the second-most
electropositive element,
behind only
caesium, and is the
second rarest naturally occurring element (after astatine)...
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fixed numerical value of the
caesium frequency, ΔνCs, the
unperturbed ground-state
hyperfine transition frequency of the
caesium 133 atom, to be 9192631770...
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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...
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chemical elements lithium (Li),
sodium (Na), pot****ium (K),
rubidium (Rb),
caesium (Cs), and
francium (Fr).
Together with
hydrogen they
constitute group 1...
- the
caesium frequency, Δ ν Cs {\displaystyle \Delta \nu _{\text{Cs}}} , the
unperturbed ground-state
hyperfine transition frequency of the
caesium-133...
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Caesium iodide or
cesium iodide (chemical
formula CsI) is the
ionic compound of
caesium and iodine. It is
often used as the
input phosphor of an X-ray...
