fɔːɹ ɛɡzˈæmpəl, sˈoʊdiəm kæn ɹɪˈækt wɪð sˈʌlfɜː tə fˈɔːɹm ðə sˈʌlfaɪd nˈɑː tˈuː z ænd vˈɛɹiəs pˌɑːlɪsˈʌlfaɪdz wɪððə fˈɔːɹmjʊlə nˈɑː tˈuː ˌɛsˈɛks ˈɛks fɹʌm tˈuː tə sˈɪks, kəntˈeɪnɪŋ ðɪ ˈaɪɑːnz.
For example, sodium can react with sulfur to form the sulfide (Na2S) and various polysulfides with the formula Na2Sx (x from 2 to 6), containing the  ions.