Contact
Get in touch
A wrong number, a bug, or an idea for the site. Email reaches a person.
There is no contact form here, because a form would mean collecting your details and this site is built not to. Email works better anyway. Write to us at the address below and a person reads it.
We usually reply within two or three working days. Data corrections get looked at first.
What to write about
A number looks wrong
The most useful email we get. Send the element, the property and the value you expected, along with where you read it. Corrections go live the same week.
Email about thisSomething is broken
A square that will not open, a chart that will not draw, a game that gets stuck. Say which browser and device you were on and we will reproduce it.
Email about thisA feature you keep wishing for
Teachers and students ask for the sharpest things. If there is a view, a property or a printable format you keep needing, we would like to hear about it.
Email about thisAdvertising and business
Questions about the ad placements, sponsorship, or licensing the tool for use somewhere else.
Email about thisWho runs this
Periodic Table is published by Periodic Room. It is a small independent project rather than a company with a support desk, which is why the answer comes from a person and sometimes takes a couple of days.
Before you write
A few things that come up often are already answered elsewhere. The about page explains where the element data comes from and why some properties are shown as unmeasured. The privacy policy covers cookies and advertising. And yes, the whole site is free, with no account and no subscription, and it will stay that way.