No, you need the 'yn' to connect the two words.
However you could say 'Yr elfen Carbon' = the element Carbon
Sorry, not best place but in Science, 3 crown level, heading for 4, came the sentence "Elfen mewn cemeg" "Element in chemistry". What is the sense of that?Everything is composed of elements, mainly in combination with other elements or as alloys! An element in chemistry makes no sense to me wnose first degree was in chemistry. Element in chemistry makes even less sense! Sorry!