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- I’ve protium, deuterium, and tritium have; that said, it may be just about attestable . It’ll be difficult given the predominance of Pentium. FWIW, pentium doesn’t exactly follow from protium, deuterium, and tritium — the latter are formed on Ancient Greek ordinal numbers (πρῶτος (prôtos, “first”), δεύτερος (deúteros, “second”), and τρίτος (trítos, “third”), respectively) + Latin -ium, whereas the former is formed from the Ancient Greek cardinal number πέντε (pénte, “five”) + Latin -ium. Consistency calls for something like *pemptium (from the ordinal form of πέντε (pénte), viz. πέμπτος (pémptos, “fifth”)), but there’s an absolute dearth of use thereof (for example, yields only gibberish, phantom hits, and ten scannos of Pompeium). What gives as the term for 41H — tetrium — … † ﴾(u):Raifʻhār (t):Doremítzwr﴿ 23:20, 12 October 2009 (UTC) , though, as you say, it doesn’t seem to have caught on like