DEFINITION OF SECOND

55-cesium-133 · Atomic Percent Abundance: 100% · Spin: 7/2+ · Stable Isotope · Possible parent nuclides: Beta from Xe-133: Electron capture from Ba-133.

Cesium is the 55 th element on the periodic table of elements. Cesium is the standard for atomic clocks, and actually provides the definition for the second!

This isotope is stable and thus has no decay products, so instead we show decay chains that lead down to it. Atomic Weight, 132.905451932. Abundance, 1×102%.

Cesium clock in a cium atomic clock, a sample of cesium-133 is heated in an oven. Cesium atoms boil off the sample and emerge from the oven at high speed ...

Tritium is a radioactive species having a half-life of 12.32 years; it occurs in natural water with an abundance of 10-18 of that of natural ...

When it comes to atomic timekeeping, the cesium-133 isotope — a variant of cesium with 133 protons and neutrons in its nucleus — is the star of ...

Standard International defines 1 second as the time needed for Cesium-133 to vibrate 9.192.631.770 times.

Cesium-133 is the only natural isotope (100% natural abundance). Cesium has no known biological role, but may substitute for potassium and so is relatively ...

銫 編輯 ... 銫 （ ㄙㄜˋ ） （英語：Caesium或Cesium；舊譯鏭），是一種化學元素，其化學符號為Cs，原子序數為55，原子量為7002132905451960000♤132.90545196 u。銫是淡金色且質地極軟的 ...

銫（原子量：132.90545196(6)）有41個已知的同位素，原子量範圍從112到152，其中只有銫-133是穩定的。壽命最長的放射性銫是銫-135，半衰期有133萬年。其次是銫-137，半衰期 ...