An Interactive Periodic Table With Element Data Cited to PubChem
The periodic table on a classroom wall stops at the basics: symbol, number, maybe mass. When you need an element's electronegativity for a bonding question, its melting point for a project, or its electron configuration for an exam, you end up on a page full of ads and unsourced numbers. Periodic table puts the key data for every element one tap away, and tells you where each figure comes from.
Steps
- Swipe the table sideways on a phone, or search by name, symbol or atomic number.
- Tap an element to open its data.
- Use the category chips to focus on one family, such as the halogens or noble gases.
What each element shows
Name, symbol, atomic mass, electron configuration, electronegativity, atomic radius, ionisation energy, electron affinity, oxidation states, standard state, melting and boiling points, density and year of discovery.
All 118 elements are there, from hydrogen to oganesson, including the lanthanides and actinides in the two rows underneath. The gaps in group 3 mark where those series belong; tap a gap or the matching row to open lanthanum or actinium.
Where the numbers come from
This is what sets it apart. The data comes from the PubChem periodic table, published by the US National Library of Medicine (NLM). The file was retrieved on 27 October 2026, and that date and the credit are on the page. NLM-created information is in the public domain.
If a field is blank, such as a melting point for a superheavy element, it's because PubChem has no value for it. Many superheavy elements have existed only a few atoms at a time for fractions of a second, so nobody has measured their bulk properties.
Using it for study
- Trends. Open the halogens (F, Cl, Br, I) one after another and watch electronegativity fall and atomic radius rise down the group. That's a standard exam question, and seeing the numbers makes it stick.
- Electron configurations. Check your written configurations, especially the exceptions like chromium and copper.
- Oxidation states help with naming compounds and predicting formulas.
- Physical properties for practical work: is this metal solid at room temperature? (Mercury and gallium are worth a look.)
Quick facts worth knowing
- The table is arranged by atomic number, and elements in the same column have similar outer electron arrangements, which is why they behave alike.
- Noble gases (group 18) have full outer shells and rarely react.
- Metals sit on the left and centre, non-metals on the right, with metalloids along the staircase between them.
Example: a project on alkali metals
Filter by alkali metals, open lithium, sodium, potassium, rubidium and caesium, and note melting points and ionisation energies. Both fall down the group, which explains why caesium reacts so violently with water. You have sourced numbers for your write-up, with a citation to NLM.
Why the source matters
Periodic table data online is surprisingly inconsistent. Different sites round atomic masses differently, quote radii measured in different ways, or copy errors from each other. For homework that's a nuisance; for a lab report or a project, it's a problem when your teacher asks where a number came from. A single, named, public-domain source with a retrieval date gives you a citation you can write down and a consistent set of values.
Privacy
According to the page, the element list is saved with the page and the element you open stays on your device. Google ads appear on the page, as across the site.
FAQ
Is every element included? Yes, hydrogen through oganesson.
Who published the data? The National Library of Medicine, via the PubChem periodic table.
Why is a melting point blank? PubChem has no value for that element.
What do the group 3 gaps mean? That's where the lanthanide and actinide series fit.
Keep a sourced periodic table handy: Periodic table.
— Alok Kumar Singh