Atomic masses follow the IUPAC 2021 standard. The number of decimal places reflects measurement uncertainty — values in brackets [x] indicate the mass number of the most stable isotope (synthetic or radioactive elements).
Select Element
Click the desired element · ESC to cancel
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Module in Development
This feature will be released in the next Atomurus version.
System
Settings
Customize your Atomurus experience — theme, display and study preferences.
Appearance
Theme
Switch between light and dark mode.
Element size
Adjust the card size in the periodic table.
Animations
Enable or disable hover animations and transitions.
Periodic Table
View mode
By color category, or heatmap by physical property.
Show lanthanides/actinides
Show or hide the separate f-block rows below the table.
Show atomic mass
Display atomic mass on each table card.
Language
Interface language
Change the language of the entire interface.
Download Table as PDF
About Atomurus
Atomurus
atomurus.com
Interactive chemistry app with dynamic periodic table, atomic models, virtual lab and calculators. Built for high school students and science enthusiasts.