Science quiz
The first 20 elements in order
Atomic numbers 1 to 20, from hydrogen to calcium. Type the elements in any order and each drops into its place.
- Format
- Type them all
- Items
- 20 answers
- Limit
- 3:00
- Level
- Easy
- Checked
- 2026.10.03
- Answers
- 20
- Time limit
- 3:00
- Order
- Any order
- Matching
- Case and accents ignored
- Type an answer; it files itself the moment it matches.
- One answer can fill several slots.
- Give up at any time to see what you missed.
- Pause whenever you like (Esc). The board hides while the clock is stopped.
Name the first 20 elements of the periodic table.
| No. | Element | Symbol |
|---|---|---|
| 1 | Not found yet | |
| 2 | Not found yet | |
| 3 | Not found yet | |
| 4 | Not found yet | |
| 5 | Not found yet | |
| 6 | Not found yet | |
| 7 | Not found yet | |
| 8 | Not found yet | |
| 9 | Not found yet | |
| 10 | Not found yet |
| No. | Element | Symbol |
|---|---|---|
| 11 | Not found yet | |
| 12 | Not found yet | |
| 13 | Not found yet | |
| 14 | Not found yet | |
| 15 | Not found yet | |
| 16 | Not found yet | |
| 17 | Not found yet | |
| 18 | Not found yet | |
| 19 | Not found yet | |
| 20 | Not found yet |
About this quiz
An element's atomic number is the number of protons in its nucleus. The first 20 elements fill the first three rows of the periodic table and start the fourth.
- Hydrogen, with one proton, is element 1; calcium, with 20, closes this list.
- Two of the first 20 have symbols that do not match their English names: Na for sodium and K for potassium.
- Helium, neon and argon are the three noble gases among the first 20.
Sources
- [1]PubChem, National Institutes of Health. Periodic Table of Elements.
Last checked October 3, 2026
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