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.
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.