- qcelemental.periodictable = <qcelemental.periodic_table.PeriodicTable object>
Nuclear and mass data about chemical elements from NIST.
Mass number, number of protons and neutrons, starting with 0 for dummies.
Element symbol from periodic table, starting with “X” for dummies. “Fe” capitalization.
Nuclide symbol in E + A form, e.g., “Li6”. List EA is a superset of E; that is, both “Li6” and “Li” present. For hydrogen, “D” and “T” also included.
Atomic mass [u].
For nuclides (e.g., “Li6”), the reported mass.
For stable elements (e.g., “Li”), the mass of the most abundant isotope (“Li7”).
For unstable elements (e.g., “Pu”), the mass of the longest-lived isotope (“Pu244”).