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Find the mystery element in six guesses. Green is a match, amber is one away. Period and Group show a number: up means the answer's number is higher, down means lower. Mass has no number: up means the answer is heavier.

Weekly challenge Ten multiple-choice questions on symbols, groups, trends and electron structure. Same ten for everyone, new every Monday, instant marking. Pupils get a result code; teachers can verify it. No accounts. Start this week's ten

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All 118 elementsEvery element with its own page: where it is found, uses, history, facts and FAQs. Groups and familiesAlkali metals to noble gases: what each family shares and how it changes down the table. Compare elementsSodium vs potassium, gold vs platinum and 38 more, side by side in plain English.

Learn the periodic table All guides

Plain-English guides to go with the bubbles: how to read the table, why groups matter, the trends, the history, and how to revise it.

How to Read the Periodic Table (A Plain-English Guide)

How to read the periodic table in minutes: what each number and symbol means, what the rows and columns tell you, and how to spot patterns.

7 min read

What Is an Atom? Protons, Neutrons, Electrons and Shells for Beginners

A plain-English guide to atoms: protons, neutrons and electrons, the nucleus, electron shells, isotopes, ions and why the Bohr model is still worth learning.

7 min read

Groups and Periods Explained: Why Columns Matter More Than Rows

Periods are the rows and groups are the columns. See what each tells you about electrons and reactivity, with all 18 groups in one table.

7 min read

Periodic Trends: Atomic Radius, Ionisation Energy and Electronegativity Made Simple

How atomic radius, ionisation energy and electronegativity change across a period and down a group, the reasons, the exceptions and a table of real values.

8 min read

For teachers

Free printable classroom resources - no sign-up, generated from the same data as the bubbles.

Element flashcards All 118 elements, single or two-sided, nine per A4 page. Plus a printable poster. Quiz worksheets Five topics for ages 11 to 16, 20 questions each, a fresh set and answer key every click. Flashcard games Ten classroom activities using the cards, from Element Snap to a Human Periodic Table. Classroom ideas Lesson starters and plenaries using the bubbles, quiz and daily puzzle.

An interactive periodic table, reimagined

Periodic Bubbles is a free interactive periodic table where all 118 elements float as bubbles you can pop, with a daily element puzzle, a weekly challenge, a quiz, an original guide to every element, plain-English articles and printable classroom resources. Made in the UK, used in classrooms everywhere, works offline on any device. About the site and who makes it.

Questions, answered simply All questions

What is the periodic table, how many elements are there, what do the colours mean, how do the games work. Short answers on one page, and every element page has its own.