NIST Atomic Weights and Isotopic Compositions with Relative Atomic Masses

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Metadata Last Checked: June 27, 2025 | Last Modified: 2010-07-01 00:00:00

The atomic weights are available for elements 1 through 118 and isotopic compositions or abundances are given when appropriate. Version 3.0.

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Complete Metadata

bureauCode	[ "006:55" ]
identifier	FDB59097467F5200E043065706813E54135
landingPage	https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses
language	[ "en" ]
programCode	[ "006:052" ]
theme	[ "Atomic / molecular / quantum", "Physics:Nuclear physics" ]