Rarest Lanthanide — All 15 Answers Ranked by Rarity
15 answers are accepted for “Name a lanthanide”. Thulium is the rarest lanthanide in this ranking, with 45,160 monthly Wikipedia views (rarity 1.000, Legendary). Erbium is the second-rarest with 47,520 monthly Wikipedia views, 1.05× the figure for Thulium. Neodymium is the most common lanthanide in this ranking, with 129,379 monthly Wikipedia views, 2.86× the figure for the rarest. Combined monthly Wikipedia views across the 15 answers: 1,128,612. Thulium is 4.0% of that total. 3 answers are Epic or Legendary: Thulium (Legendary), Erbium (Epic), and Terbium (Epic).
Quick answer
Monthly English Wikipedia pageviews. Source: Wikidata + Wikipedia pageviews (2026-10).
Ranked answers
| Rank | Answer | Tier | Rarity | Monthly Wikipedia views |
|---|---|---|---|---|
| 1 | Thulium on Wikipedia | Legendary | 1.000 | 45,160 |
| 2 | Erbium on Wikipedia | Epic | 0.929 | 47,520 |
| 3 | Terbium on Wikipedia | Epic | 0.857 | 48,379 |
| 4 | Praseodymium on Wikipedia | Rare | 0.786 | 58,947 |
| 5 | Europium on Wikipedia | Rare | 0.714 | 61,430 |
| 6 | Dysprosium on Wikipedia | Rare | 0.643 | 63,746 |
| 7 | Ytterbium on Wikipedia | Uncommon | 0.571 | 69,680 |
| 8 | Lutetium on Wikipedia | Uncommon | 0.500 | 72,936 |
| 9 | Lanthanum on Wikipedia | Uncommon | 0.429 | 80,708 |
| 10 | Samarium on Wikipedia | Familiar | 0.357 | 81,136 |
| 11 | Cerium on Wikipedia | Familiar | 0.286 | 81,614 |
| 12 | Promethium on Wikipedia | Familiar | 0.214 | 92,842 |
| 13 | Holmium on Wikipedia | Common | 0.143 | 94,548 |
| 14 | Gadolinium on Wikipedia | Common | 0.071 | 100,587 |
| 15 | Neodymium on Wikipedia | Common | 0.000 | 129,379 |
FAQ
What is the rarest lanthanide?
Thulium is the rarest lanthanide in this ranking, with 45,160 monthly Wikipedia views (rarity 1.000, Legendary).
How many lanthanides are there?
There are 15 lanthanides in this ranking, from Thulium (rarest) to Neodymium (most common).
What is the most common lanthanide?
Neodymium is the most common lanthanide in this ranking, with 129,379 monthly Wikipedia views (Common).
Play
Unlimited mode uses this prompt. A rarer correct answer scores more.
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Sources
Recorded source: Wikidata + Wikipedia pageviews (2026-10). The answer list is compiled from Wikidata (CC0), and the view counts are monthly English Wikipedia pageviews. Rarity is the percentile of the popularity figure inside this prompt: 1 is the rarest and 0 is the most common. Linked names open the English Wikipedia article stored on that answer.