Atom Builder
Count the electrons in an atom diagram and name the element. Learn the first eighteen elements and their symbols.
- Brain
- New puzzle every day
- Free, plays in your browser
- Mouse or touch
- Added 30 October 2026
- #chemistry
- #atoms
- #elements
- #dailyquiz
- #science
- #learning
Atom Builder
0% · Getting ready
Loading Atom Builder 0%Watch a 20-second trailer
A real run of the game, recorded with captions and no sound.
How to play
- A diagram shows electrons in shells around a nucleus. Count the blue electrons.
- In a neutral atom the electrons equal the protons, which is the atomic number. Pick the element it must be.
- Shells hold 2, then 8, then 8 electrons. Later questions also ask for symbols and atomic numbers.
- The clock starts on your first tap and your time is saved. Every day has the same quiz for everyone.
Controls: mouse or touch. Made by CalcoTools.
Tips and strategy
- Count the electrons in each shell and add them up.
- Hydrogen has one electron and helium two. They fill the first shell.
- A full outer shell, like neon and argon, means a noble gas.
- Learn the symbol with the name: Na is sodium, from natrium.
FAQ
- Which elements appear?
- The first eighteen, from hydrogen to argon.
- What is the atomic number?
- The number of protons in the nucleus. In a neutral atom it equals the number of electrons.
- Is the daily the same for everyone?
- Yes, on the same UTC day.
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