Contact Periodic Table

Email

[email protected]

We read every message and aim to reply within a few business days.

Reporting a wrong value

If an element value looks wrong, please include:

• the element and the property (for example, the melting point of gallium)
• the value shown on Periodic Table
• the value you expected, and where it comes from (a data book, IUPAC, NIST or a paper)

Reference sources sometimes disagree, especially for heavy and synthetic elements, so the source helps us check quickly.

Reporting a bug

If the table or a page behaves oddly, tell us the page address, your browser and device, what you did, what you saw and what you expected.

Suggesting a feature

Tell us what you would like to look up or compare. Suggestions help us decide what to add next. You can see everything that exists on the sitemap.

Please keep it simple

We can't do homework or lab reports for you, and we can't give safety advice on handling chemicals; always follow your lab's safety data sheets. You never need to send passwords or personal details.