- an old title of hafnium.
- the very first recommended name for a supposed brand new part of the rare-earth group, associated lutecium and scandium within the gadolinite earths. It is currently considered exactly the same as lutetium. The recommended expression ended up being Ct (no period), but this name and logo are no longer used.
- A former name of hafnium.
- initial recommended title for a supposed brand-new section of the rare-earth team, accompanying lutecium and scandium in the gadolinite earths. It is currently considered exactly the same as lutetium. The suggested symbolization ended up being Ct (no duration), but this name and symbol are not any much longer used.
Variant for "celtium"
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