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Federal
Periodic Table of the Elements: Atomic Properties recent views
National Institute of Standards and Technology —
A periodic table, containing NIST critically-evaluated data on atomic properties of the elements [SP 966] was designed as a NIST handout for use at exhibitions and... -
Federal
Standard and conventional atomic weights 2016 abridged to four significant digits recent views
Department of the Interior —
2016 four-figure standard and conventional atomic weights of the chemical elements -
Federal
Table of standard atomic weights of the elements 2015 recent views
Department of the Interior —
Standard atomic weights of the elements 2015