Furthermore, the nitrogen atom may be replaced by a phosphorus, arsenic, or antimony atom (the heavier nonmetallic pnictogens), creating a phosphonium () or arsonium () cation that can itself be substituted similarly; while stibonium () itself is not known, some of its organic derivatives are characterised.
fˌɜːðɚmˈoːɹ, ðə nˈaɪtɹədʒən ˈæɾəm mˈeɪ biː ɹᵻplˈeɪst baɪ ɐ fˈɑːsfoːɹəs, ˈɑːɹsnɪk, ɔːɹ ˈæntɪməni ˈæɾəm ðə hˈɛviɚ nˌɑːnmətˈælɪk pˈiːnˈɪktədʒənz, kɹiːˈeɪɾɪŋ ɐ fəsfˈoʊniəm ɔːɹ ɑːɹsˈoʊniəm kˈæɾaɪən ðæt kæn ɪtsˈɛlf biː sˈʌbstɪtˌuːɾᵻd sˈɪmɪlɚli; wˌaɪl stɪbˈoʊniəm ɪtsˈɛlf ɪz nˌɑːt nˈoʊn, sˌʌm ʌv ɪts ɔːɹɡˈænɪk dᵻɹˈɪvətˌɪvz ɑːɹ kˈæɹɪktɚɹˌaɪzd.