Why is methylene a ground state triplet while silylene is a ground state singlet?

TitleWhy is methylene a ground state triplet while silylene is a ground state singlet?
Publication TypeJournal Article
Year of Publication2003
AuthorsApeloig, Y, Pauncz, R, Karni, M, West, R, Steiner, W, Chapman, D
JournalOrganometallics
Volume22
Pagination3250-3256
Date PublishedAug 4
Accession Number706PW-0011