The alkali metal polonides are all ionic compounds containing the Po2− ion; they are very chemically stable and can be produced by direct reaction of the elements at around 300–400 °C.
ðɪ ˈælkəlˌaɪ mˈɛɾəl pˈɑːlənˌaɪdz ɑːɹ ˈɔːl aɪˈɑːnɪk kˈɑːmpaʊndz kəntˈeɪnɪŋ ðə pˈoʊ tˈuː mˈaɪnəs ˈaɪɑːn; ðeɪ ɑːɹ vˈɛɹi kˈɛmɪkli stˈeɪbəl ænd kæn biː pɹədˈuːst baɪ dᵻɹˈɛkt ɹɪˈækʃən ʌvðɪ ˈɛlɪmənts æɾ ɚɹˈaʊnd θɹˈiːhˈʌndɹɪd fˈoːɹhˈʌndɹɪd dᵻɡɹˈiːz sˈiː.