The alkali metals form many intermetallic compounds with each other and the elements from groups 2 to 13 in the periodic table of varying stoichiometries, such as the sodium amalgams with mercury, including Na5Hg8 and Na3Hg.
ðɪ ˈælkəlˌaɪ mˈɛɾəlz fˈɔːɹm mˈɛni ˌɪntɚmətˈælɪk kˈɑːmpaʊndz wɪð ˈiːtʃ ˈʌðɚ ænd ðɪ ˈɛlɪmənts fɹʌm ɡɹˈuːps tˈuː tə θˈɜːtiːn ɪnðə pˌiəɹɪˈɑːdɪk tˈeɪbəl ʌv vˈɛɹiɪŋ stˌoʊɪkɪˈɑːmətɹiz, sˈʌtʃ ɐz ðə sˈoʊdiəm ɐmˈælɡæmz wɪð mˈɜːkjʊɹi, ɪŋklˈuːdɪŋ nˈɑː fˈaɪv ˌeɪtʃdʒˈiː ˈeɪt ænd nˈɑː θɹˈiː ˌeɪtʃdʒˈiː.