Atomic Weights of the Elements: Review 2000

A review of internationally accepted standard atomic weights for the elements, published by the IUPAC Commission on Atomic Weights and Isotopic Abundances. The work summarizes the development of atomic-weight determinations in the 20th century and variations recognized in the latter part of the century. It reflects the increasing scientific interest in source-specific atomic weight differences and their impact on fundamental constants.

Use Cases

• Calibrating scientific instruments based on precise atomic weight and isotope abundance data.
• Investigating natural and industrial physicochemical processes based on variations in isotope-abundance ratios.
• Refining the values of fundamental constants like the Avogadro and Faraday constants based on accurate atomic weight determinations.
• Supporting trade and commerce subject to ethical and legal standards that rely on internationally accepted atomic weights.

Strengths

• Data is associated with carefully evaluated uncertainties, as stated in the description.
• Atomic masses are determined with a relative uncertainty better than 1 × 10–7, and isotope abundances for many elements are measured to better than 1 × 10–3.
• Published by the authoritative IUPAC Commission on Atomic Weights and Isotopic Abundances (CAWIA).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

Commission on Atomic Weights and Isotopic Abundances (CAWIA) of the International Union of Pure and Applied Chemistry (IUPAC).

Collection Method

Review and evaluation of atomic weights based on isotopic composition and atomic mass measurements.

Time Range

Focuses on the 20th century, with detailed changes in the latter part of the century.

Freshness

Last updated date is unknown.

Geography

International scope.