I don't believe "element" has an antonym.
An antonym for "girder," which refers to a large beam used in construction to support weight, could be "void" or "space." While "girder" implies a structural element that provides support, its antonyms suggest an absence of structure or support. Other possible antonyms might include "lightweight" or "non-supporting element," depending on the context.
Antonyms
antonyms
What are the antonyms for cavernous
what isbrief of antonyms
antonyms
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yes antonyms are opposite
Antonyms for "die" include:live
antonyms for said
The antonyms of dirty is clean