The standard atomic weights of twelve elements having two or more stable isotopes have variability of atomic-weight values in natural terrestrial materials. These are given in table 1 below.

See below for a list of chemical elements and their atomic weights. The concept of atomic weight is fundamental to chemistry, because most chemical reactions take place in accordance with simple …

Excerpt of an IUPAC periodic table showing the interval notation of the standard atomic weights of boron, carbon, and nitrogen (Chemistry International, IUPAC). Example: the pie chart for boron …

Since 1902, the Commission regularly publishes critical evaluation of atomic weights of elements and below is the most recent definitive table of the standard atomic weights.

Atomic Weight Chart Periodic Table with Atomic Weight Trend of Atomic Weight Table of Atomic Weight

Mar 9, 2025 · Atomic mass of all elements (along with the rounded off values) is mentioned in the chart below.

Sep 6, 2025 · Accurate atomic weight values for all 118 elements with definitions, uses, history, and comparison to atomic mass and mass number.

Atomic Weights and Isotopic Compositions for All Elements

Explore how atomic mass changes with atomic number in the periodic table of elements via interactive plots.

This is a list of all chemical elements in periodic table with their symbols and atomic weight. Click on the column header to sort the table by that column or click on an element name to get detailed facts …