|Z - the atomic number of an element.|
|A - the mass number of an element (indicates the specific isotope of an element).|
|Difference between Experiment and Theory
- The uncertainties for the values of the differences between experiment and theory were calculated using
the "root-mean-square" expression
utot = [ (uth)2 + (uex)2 ]1/2,where utot is the total uncertainty, uth is the theoretical uncertainty, and uex is the experimental uncertainty. All uncertainties are provided to two decimal places and the difference values are then rounded or extended to also have two decimal places. In the next version of the database, we plan to provide all uncertainties with two significant figures and the difference values will be provided to the same number of decimal places.