Science quiz
Click the first 36 elements in order
The symbols of the first four periods, hydrogen to krypton. Click them in order of atomic number. The next one is never shown.
- Format
- Click the grid
- Items
- 36 to click
- Limit
- 3:00
- Level
- Hard
- Checked
- 2026.10.03
- Targets
- 36
- Time limit
- 3:00
- Minefield
- One wrong click ends it
- Work out what comes next and click it.
- The full order is shown when the game ends.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Click the symbols in order of atomic number, starting with H. The grid appears when you start.
About this quiz
The first four periods hold 36 elements: two, eight, eight and eighteen. The fourth period is where the transition metals first appear, from scandium to zinc.
- Periods end on a noble gas: He at 2, Ne at 10, Ar at 18 and Kr at 36.
- The symbols stay in A to Z order, so a button's place is no clue.
- After the game every button shows its number in the order.
Sources
- [1]PubChem, National Institutes of Health. Periodic Table of Elements.
Last checked October 3, 2026
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