Atomic clocks are more accurate than those used to define the second, suggesting the definition might need to change ...

at least — is 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of a stationary cesium-133 atom at a temperature of 0K.

The thorium atom transition has a frequency roughly one million times higher than the cesium atom's. This means that, although it has been measured with a lower accuracy than the current state-of ...

Cesium (Cs) and rubidium (Rb) pack seven and nine hydrogen atoms per metal atom, respectively. Semenok noted that that Сs and Rb are relatively heavy atoms. “For rubidium hydride RbH9 the mass ...

In 1967, the second was defined as the equivalent of the time it takes for a cesium 133 atom to oscillate 9,192,631,770 times between the two energy states. Cesium atomic clocks define a second ...

ranges from 0.7 for cesium to 4.0 for fluorine. The higher an element's electronegativity, the stronger its ability to attract electrons and create a partial negative charge. In a chemical bond, the ...