Formation of bonds to B, Si, P, Sn.
f ɔ ɹ m eɪ ʃ ə n WORD_BOUNDARY ʌ v WORD_BOUNDARY b ɑ n d z WORD_BOUNDARY t ə WORD_BOUNDARY b iː WORD_BOUNDARY s iː WORD_BOUNDARY p iː WORD_BOUNDARY ɛ s ɛ n WORD_BOUNDARY