These substances include some elements and many more polyatomic ions; the polyatomic ions are especially similar to the alkali metals in their large size and weak polarising power.
ðiːz sˈʌbstənsᵻz ɪŋklˈuːd sˌʌm ˈɛlɪmənts ænd mˈɛni mˈoːɹ pˌɑːlɪɐtˈɑːmɪk ˈaɪɑːnz; ðə pˌɑːlɪɐtˈɑːmɪk ˈaɪɑːnz ɑːɹ ɪspˈɛʃəli sˈɪmɪlɚ tə ðɪ ˈælkəlˌaɪ mˈɛɾəlz ɪn ðɛɹ lˈɑːɹdʒ sˈaɪz ænd wˈiːk pˈoʊlɚɹˌaɪzɪŋ pˈaʊɚ.