Science quiz
Elements that do not end in ium
79 of the 118 elements end in ium. The other 39 are here, listed by atomic number. Type them in any order.
- Format
- Type them all
- Items
- 39 answers
- Limit
- 6:00
- Level
- Medium
- Checked
- 2026.10.03
- Answers
- 39
- Time limit
- 6:00
- 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 elements whose names do not end in ium.
| No. | Element | Symbol |
|---|---|---|
| 1 | 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 | |
| 14 | Not found yet | |
| 15 | Not found yet | |
| 16 | Not found yet | |
| 17 | Not found yet | |
| 18 | Not found yet | |
| 25 | Not found yet |
| No. | Element | Symbol |
|---|---|---|
| 26 | Not found yet | |
| 27 | Not found yet | |
| 28 | Not found yet | |
| 29 | Not found yet | |
| 30 | Not found yet | |
| 33 | Not found yet | |
| 35 | Not found yet | |
| 36 | Not found yet | |
| 42 | Not found yet | |
| 47 | Not found yet | |
| 50 | Not found yet | |
| 51 | Not found yet | |
| 53 | Not found yet |
| No. | Element | Symbol |
|---|---|---|
| 54 | Not found yet | |
| 57 | Not found yet | |
| 73 | Not found yet | |
| 74 | Not found yet | |
| 78 | Not found yet | |
| 79 | Not found yet | |
| 80 | Not found yet | |
| 82 | Not found yet | |
| 83 | Not found yet | |
| 85 | Not found yet | |
| 86 | Not found yet | |
| 117 | Not found yet | |
| 118 | Not found yet |
About this quiz
The ium ending became the rule for metals in the nineteenth century. The exceptions are the elements known since antiquity, the nonmetals, the halogens in ine and the noble gases in on.
- The two newest names on this list are tennessine and oganesson, both approved in 2016.
- The British spelling aluminium ends in ium, so it is not on this list; the American spelling aluminum is not counted either.
- Helium is the only noble gas that ends in ium.
Sources
- [1]PubChem, National Institutes of Health. Periodic Table of Elements.
Last checked October 3, 2026
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